separated npmignore entries into their related folders to reduce final package size

.npmignore

@@ -4,33 +4,17 @@
 !default.perspectivev3
 .*
 .bak/
-.DS_Store
-.gradle
-.idea
 *.bak
 *.hmap
-*.iml
 *.ipa
-*.keystore
 *.log
 *.mode1v3
 *.mode2v3
 *.moved-aside
 *.pbxuser
 *.perspectivev3
 *.tgz
-*.xccheckout
-*.xcuserstate
 **/.vscode/.react/
 \.buckd/
 ~*
-android/build/
 buck-out/
-build/
-DerivedData
-local.properties
-node_modules/
-package-lock.json
-project.xcworkspace
-xcuserdata
-yarn.lock

android/.npmignore

@@ -0,0 +1,11 @@
+*.iml
+.DS_Store
+.gradle/
+.idea/
+.npmignore
+build/
+gradle/
+gradlew
+gradlew.bat
+local.properties
+*.keystore

ios/.npmignore

@@ -0,0 +1,9 @@
+*/project.xcworkspace/
+*/xcuserdata/
+.DS_Store
+.npmignore
+Pods/
+build/
+DerivedData
+*.xccheckout
+*.xcuserstate

package.json

@@ -3,6 +3,12 @@
   "version": "4.0.0-rc.1",
   "description": "Measure text accurately before laying it out and get font information from your App",
   "main": "index.js",
+  "files": [
+    "android/",
+	"ios/",
+	"index.d.ts",
+	"index.js.flow"
+  ],
   "keywords": [
     "react-native",
     "measure",