use lisp-case to avoid issues with case sensitive filesystems

package.json

@@ -2,12 +2,12 @@
   "name": "onscreen",
   "version": "1.1.2",
   "description": "A light library that does stuff when the matched elements enter or leave the viewport",
-  "main": "dist/onScreen.umd.js",
-  "jsnext:main": "dist/onScreen.es6.js",
+  "main": "dist/on-screen.umd.js",
+  "jsnext:main": "dist/on-screen.es6.js",
   "scripts": {
     "prebuild": "eslint lib test",
     "build": "rollup -c rollup.config.umd.js && rollup -c rollup.config.es6.js",
-    "postbuild": "uglifyjs -c --screw-ie8 dist/OnScreen.umd.js -o dist/OnScreen.umd.min.js --source-map dist/OnScreen.umd.min.map",
+    "postbuild": "uglifyjs -c --screw-ie8 dist/on-screen.umd.js -o dist/on-screen.umd.min.js --source-map dist/on-screen.umd.min.map",
     "prepublish": "npm run build",
     "pretest": "rollup -c rollup.config.test.js",
     "test": "mocha-phantomjs -v 800x600 http://localhost:8080/test/test-runner.html",

rollup.config.es6.js

@@ -1,6 +1,6 @@
 import config from './rollup.config';
 
 config.format = 'es6';
-config.dest = 'dist/OnScreen.es6.js';
+config.dest = 'dist/on-screen.es6.js';
 
 export default config;

rollup.config.umd.js

@@ -1,7 +1,7 @@
 import config from './rollup.config';
 
 config.format = 'umd';
-config.dest = 'dist/OnScreen.umd.js';
+config.dest = 'dist/on-screen.umd.js';
 config.moduleName = 'OnScreen';
 
 export default config;