diff --git a/demo/package-lock.json b/demo/package-lock.json
index bd1ef1c..d3b2926 100644
--- a/demo/package-lock.json
+++ b/demo/package-lock.json
@@ -2395,7 +2395,7 @@
     "css-what": {
       "version": "2.1.0",
       "resolved": "https://registry.npmjs.org/css-what/-/css-what-2.1.0.tgz",
-      "integrity": "sha1-lGfQMsOM+u+58teVASUwYvh/ob0="
+      "integrity": "sha512-HtdI8TqiYjVrBI0C2VLF8fwphIa49EaHPVo64hrX+QHCPBtjp2FW1g4+jNeC6v7bBSr2z7v2USnQ6GU+VPOzgQ=="
     },
     "cssesc": {
       "version": "0.1.0",
@@ -4001,7 +4001,8 @@
         },
         "ansi-regex": {
           "version": "2.1.1",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "aproba": {
           "version": "1.1.1",
@@ -4044,7 +4045,8 @@
         },
         "balanced-match": {
           "version": "0.4.2",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "bcrypt-pbkdf": {
           "version": "1.0.1",
@@ -4057,6 +4059,7 @@
         "block-stream": {
           "version": "0.0.9",
           "bundled": true,
+          "optional": true,
           "requires": {
             "inherits": "2.0.3"
           }
@@ -4064,6 +4067,7 @@
         "boom": {
           "version": "2.10.1",
           "bundled": true,
+          "optional": true,
           "requires": {
             "hoek": "2.16.3"
           }
@@ -4071,6 +4075,7 @@
         "brace-expansion": {
           "version": "1.1.7",
           "bundled": true,
+          "optional": true,
           "requires": {
             "balanced-match": "0.4.2",
             "concat-map": "0.0.1"
@@ -4078,7 +4083,8 @@
         },
         "buffer-shims": {
           "version": "1.0.0",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "caseless": {
           "version": "0.12.0",
@@ -4092,30 +4098,36 @@
         },
         "code-point-at": {
           "version": "1.1.0",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "combined-stream": {
           "version": "1.0.5",
           "bundled": true,
+          "optional": true,
           "requires": {
             "delayed-stream": "1.0.0"
           }
         },
         "concat-map": {
           "version": "0.0.1",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "console-control-strings": {
           "version": "1.1.0",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "core-util-is": {
           "version": "1.0.2",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "cryptiles": {
           "version": "2.0.5",
           "bundled": true,
+          "optional": true,
           "requires": {
             "boom": "2.10.1"
           }
@@ -4150,7 +4162,8 @@
         },
         "delayed-stream": {
           "version": "1.0.0",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "delegates": {
           "version": "1.0.0",
@@ -4177,7 +4190,8 @@
         },
         "extsprintf": {
           "version": "1.0.2",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "forever-agent": {
           "version": "0.6.1",
@@ -4196,11 +4210,13 @@
         },
         "fs.realpath": {
           "version": "1.0.0",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "fstream": {
           "version": "1.0.11",
           "bundled": true,
+          "optional": true,
           "requires": {
             "graceful-fs": "4.1.11",
             "inherits": "2.0.3",
@@ -4251,6 +4267,7 @@
         "glob": {
           "version": "7.1.2",
           "bundled": true,
+          "optional": true,
           "requires": {
             "fs.realpath": "1.0.0",
             "inflight": "1.0.6",
@@ -4262,7 +4279,8 @@
         },
         "graceful-fs": {
           "version": "4.1.11",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "har-schema": {
           "version": "1.0.5",
@@ -4286,6 +4304,7 @@
         "hawk": {
           "version": "3.1.3",
           "bundled": true,
+          "optional": true,
           "requires": {
             "boom": "2.10.1",
             "cryptiles": "2.0.5",
@@ -4295,7 +4314,8 @@
         },
         "hoek": {
           "version": "2.16.3",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "http-signature": {
           "version": "1.1.1",
@@ -4310,6 +4330,7 @@
         "inflight": {
           "version": "1.0.6",
           "bundled": true,
+          "optional": true,
           "requires": {
             "once": "1.4.0",
             "wrappy": "1.0.2"
@@ -4317,7 +4338,8 @@
         },
         "inherits": {
           "version": "2.0.3",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "ini": {
           "version": "1.3.4",
@@ -4327,6 +4349,7 @@
         "is-fullwidth-code-point": {
           "version": "1.0.0",
           "bundled": true,
+          "optional": true,
           "requires": {
             "number-is-nan": "1.0.1"
           }
@@ -4338,7 +4361,8 @@
         },
         "isarray": {
           "version": "1.0.0",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "isstream": {
           "version": "0.1.2",
@@ -4401,11 +4425,13 @@
         },
         "mime-db": {
           "version": "1.27.0",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "mime-types": {
           "version": "2.1.15",
           "bundled": true,
+          "optional": true,
           "requires": {
             "mime-db": "1.27.0"
           }
@@ -4413,17 +4439,20 @@
         "minimatch": {
           "version": "3.0.4",
           "bundled": true,
+          "optional": true,
           "requires": {
             "brace-expansion": "1.1.7"
           }
         },
         "minimist": {
           "version": "0.0.8",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "mkdirp": {
           "version": "0.5.1",
           "bundled": true,
+          "optional": true,
           "requires": {
             "minimist": "0.0.8"
           }
@@ -4473,7 +4502,8 @@
         },
         "number-is-nan": {
           "version": "1.0.1",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "oauth-sign": {
           "version": "0.8.2",
@@ -4488,6 +4518,7 @@
         "once": {
           "version": "1.4.0",
           "bundled": true,
+          "optional": true,
           "requires": {
             "wrappy": "1.0.2"
           }
@@ -4513,7 +4544,8 @@
         },
         "path-is-absolute": {
           "version": "1.0.1",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "performance-now": {
           "version": "0.2.0",
@@ -4522,7 +4554,8 @@
         },
         "process-nextick-args": {
           "version": "1.0.7",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "punycode": {
           "version": "1.4.1",
@@ -4555,6 +4588,7 @@
         "readable-stream": {
           "version": "2.2.9",
           "bundled": true,
+          "optional": true,
           "requires": {
             "buffer-shims": "1.0.0",
             "core-util-is": "1.0.2",
@@ -4597,13 +4631,15 @@
         "rimraf": {
           "version": "2.6.1",
           "bundled": true,
+          "optional": true,
           "requires": {
             "glob": "7.1.2"
           }
         },
         "safe-buffer": {
           "version": "5.0.1",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "semver": {
           "version": "5.3.0",
@@ -4623,6 +4659,7 @@
         "sntp": {
           "version": "1.0.9",
           "bundled": true,
+          "optional": true,
           "requires": {
             "hoek": "2.16.3"
           }
@@ -4653,6 +4690,7 @@
         "string-width": {
           "version": "1.0.2",
           "bundled": true,
+          "optional": true,
           "requires": {
             "code-point-at": "1.1.0",
             "is-fullwidth-code-point": "1.0.0",
@@ -4662,6 +4700,7 @@
         "string_decoder": {
           "version": "1.0.1",
           "bundled": true,
+          "optional": true,
           "requires": {
             "safe-buffer": "5.0.1"
           }
@@ -4674,6 +4713,7 @@
         "strip-ansi": {
           "version": "3.0.1",
           "bundled": true,
+          "optional": true,
           "requires": {
             "ansi-regex": "2.1.1"
           }
@@ -4686,6 +4726,7 @@
         "tar": {
           "version": "2.2.1",
           "bundled": true,
+          "optional": true,
           "requires": {
             "block-stream": "0.0.9",
             "fstream": "1.0.11",
@@ -4735,7 +4776,8 @@
         },
         "util-deprecate": {
           "version": "1.0.2",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "uuid": {
           "version": "3.0.1",
@@ -4760,7 +4802,8 @@
         },
         "wrappy": {
           "version": "1.0.2",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         }
       }
     },
@@ -9588,7 +9631,8 @@
             },
             "ansi-regex": {
               "version": "2.1.1",
-              "bundled": true
+              "bundled": true,
+              "optional": true
             },
             "aproba": {
               "version": "1.1.1",
@@ -9631,7 +9675,8 @@
             },
             "balanced-match": {
               "version": "0.4.2",
-              "bundled": true
+              "bundled": true,
+              "optional": true
             },
             "bcrypt-pbkdf": {
               "version": "1.0.1",
@@ -9644,6 +9689,7 @@
             "block-stream": {
               "version": "0.0.9",
               "bundled": true,
+              "optional": true,
               "requires": {
                 "inherits": "2.0.3"
               }
@@ -9651,6 +9697,7 @@
             "boom": {
               "version": "2.10.1",
               "bundled": true,
+              "optional": true,
               "requires": {
                 "hoek": "2.16.3"
               }
@@ -9658,6 +9705,7 @@
             "brace-expansion": {
               "version": "1.1.7",
               "bundled": true,
+              "optional": true,
               "requires": {
                 "balanced-match": "0.4.2",
                 "concat-map": "0.0.1"
@@ -9665,7 +9713,8 @@
             },
             "buffer-shims": {
               "version": "1.0.0",
-              "bundled": true
+              "bundled": true,
+              "optional": true
             },
             "caseless": {
               "version": "0.12.0",
@@ -9679,26 +9728,31 @@
             },
             "code-point-at": {
               "version": "1.1.0",
-              "bundled": true
+              "bundled": true,
+              "optional": true
             },
             "combined-stream": {
               "version": "1.0.5",
               "bundled": true,
+              "optional": true,
               "requires": {
                 "delayed-stream": "1.0.0"
               }
             },
             "concat-map": {
               "version": "0.0.1",
-              "bundled": true
+              "bundled": true,
+              "optional": true
             },
             "console-control-strings": {
               "version": "1.1.0",
-              "bundled": true
+              "bundled": true,
+              "optional": true
             },
             "core-util-is": {
               "version": "1.0.2",
-              "bundled": true
+              "bundled": true,
+              "optional": true
             },
             "cryptiles": {
               "version": "2.0.5",
@@ -9738,7 +9792,8 @@
             },
             "delayed-stream": {
               "version": "1.0.0",
-              "bundled": true
+              "bundled": true,
+              "optional": true
             },
             "delegates": {
               "version": "1.0.0",
@@ -9760,7 +9815,8 @@
             },
             "extsprintf": {
               "version": "1.0.2",
-              "bundled": true
+              "bundled": true,
+              "optional": true
             },
             "forever-agent": {
               "version": "0.6.1",
@@ -9779,11 +9835,13 @@
             },
             "fs.realpath": {
               "version": "1.0.0",
-              "bundled": true
+              "bundled": true,
+              "optional": true
             },
             "fstream": {
               "version": "1.0.11",
               "bundled": true,
+              "optional": true,
               "requires": {
                 "graceful-fs": "4.1.11",
                 "inherits": "2.0.3",
@@ -9834,6 +9892,7 @@
             "glob": {
               "version": "7.1.2",
               "bundled": true,
+              "optional": true,
               "requires": {
                 "fs.realpath": "1.0.0",
                 "inflight": "1.0.6",
@@ -9845,7 +9904,8 @@
             },
             "graceful-fs": {
               "version": "4.1.11",
-              "bundled": true
+              "bundled": true,
+              "optional": true
             },
             "har-schema": {
               "version": "1.0.5",
@@ -9879,7 +9939,8 @@
             },
             "hoek": {
               "version": "2.16.3",
-              "bundled": true
+              "bundled": true,
+              "optional": true
             },
             "http-signature": {
               "version": "1.1.1",
@@ -9894,6 +9955,7 @@
             "inflight": {
               "version": "1.0.6",
               "bundled": true,
+              "optional": true,
               "requires": {
                 "once": "1.4.0",
                 "wrappy": "1.0.2"
@@ -9901,7 +9963,8 @@
             },
             "inherits": {
               "version": "2.0.3",
-              "bundled": true
+              "bundled": true,
+              "optional": true
             },
             "ini": {
               "version": "1.3.4",
@@ -9911,6 +9974,7 @@
             "is-fullwidth-code-point": {
               "version": "1.0.0",
               "bundled": true,
+              "optional": true,
               "requires": {
                 "number-is-nan": "1.0.1"
               }
@@ -9922,7 +9986,8 @@
             },
             "isarray": {
               "version": "1.0.0",
-              "bundled": true
+              "bundled": true,
+              "optional": true
             },
             "isstream": {
               "version": "0.1.2",
@@ -9985,11 +10050,13 @@
             },
             "mime-db": {
               "version": "1.27.0",
-              "bundled": true
+              "bundled": true,
+              "optional": true
             },
             "mime-types": {
               "version": "2.1.15",
               "bundled": true,
+              "optional": true,
               "requires": {
                 "mime-db": "1.27.0"
               }
@@ -9997,17 +10064,20 @@
             "minimatch": {
               "version": "3.0.4",
               "bundled": true,
+              "optional": true,
               "requires": {
                 "brace-expansion": "1.1.7"
               }
             },
             "minimist": {
               "version": "0.0.8",
-              "bundled": true
+              "bundled": true,
+              "optional": true
             },
             "mkdirp": {
               "version": "0.5.1",
               "bundled": true,
+              "optional": true,
               "requires": {
                 "minimist": "0.0.8"
               }
@@ -10055,7 +10125,8 @@
             },
             "number-is-nan": {
               "version": "1.0.1",
-              "bundled": true
+              "bundled": true,
+              "optional": true
             },
             "oauth-sign": {
               "version": "0.8.2",
@@ -10070,6 +10141,7 @@
             "once": {
               "version": "1.4.0",
               "bundled": true,
+              "optional": true,
               "requires": {
                 "wrappy": "1.0.2"
               }
@@ -10095,7 +10167,8 @@
             },
             "path-is-absolute": {
               "version": "1.0.1",
-              "bundled": true
+              "bundled": true,
+              "optional": true
             },
             "performance-now": {
               "version": "0.2.0",
@@ -10104,7 +10177,8 @@
             },
             "process-nextick-args": {
               "version": "1.0.7",
-              "bundled": true
+              "bundled": true,
+              "optional": true
             },
             "punycode": {
               "version": "1.4.1",
@@ -10137,6 +10211,7 @@
             "readable-stream": {
               "version": "2.2.9",
               "bundled": true,
+              "optional": true,
               "requires": {
                 "buffer-shims": "1.0.0",
                 "core-util-is": "1.0.2",
@@ -10179,13 +10254,15 @@
             "rimraf": {
               "version": "2.6.1",
               "bundled": true,
+              "optional": true,
               "requires": {
                 "glob": "7.1.2"
               }
             },
             "safe-buffer": {
               "version": "5.0.1",
-              "bundled": true
+              "bundled": true,
+              "optional": true
             },
             "semver": {
               "version": "5.3.0",
@@ -10236,6 +10313,7 @@
             "string-width": {
               "version": "1.0.2",
               "bundled": true,
+              "optional": true,
               "requires": {
                 "code-point-at": "1.1.0",
                 "is-fullwidth-code-point": "1.0.0",
@@ -10245,6 +10323,7 @@
             "string_decoder": {
               "version": "1.0.1",
               "bundled": true,
+              "optional": true,
               "requires": {
                 "safe-buffer": "5.0.1"
               }
@@ -10257,6 +10336,7 @@
             "strip-ansi": {
               "version": "3.0.1",
               "bundled": true,
+              "optional": true,
               "requires": {
                 "ansi-regex": "2.1.1"
               }
@@ -10269,6 +10349,7 @@
             "tar": {
               "version": "2.2.1",
               "bundled": true,
+              "optional": true,
               "requires": {
                 "block-stream": "0.0.9",
                 "fstream": "1.0.11",
@@ -10318,7 +10399,8 @@
             },
             "util-deprecate": {
               "version": "1.0.2",
-              "bundled": true
+              "bundled": true,
+              "optional": true
             },
             "uuid": {
               "version": "3.0.1",
@@ -10343,7 +10425,8 @@
             },
             "wrappy": {
               "version": "1.0.2",
-              "bundled": true
+              "bundled": true,
+              "optional": true
             }
           }
         },