Initial web implementation

Summary: @​public

This diff does a couple of things:
- Move all the code in a src/ folder
- Move bezier.js in the Animated folder
- Rename Animated.js into AnimatedImplementation.js and adds two entry points: AnimatedReactNative.js and AnimatedWeb.js
- Implement very dumb polyfills for flattenStyle, Set and InteractionManager
- Import my work in progress demo.html file to make sure that the code is actually working.

Everything is not working correctly:
- It calls forceUpdate on every frame and doesn't use bindings because setNativeProps is not implemented
- None of the style: {transform} are working because React web doesn't know about the array notation for transform
- The demo need more work

Reviewed By: @sahrens

Differential Revision: D2464277

Libraries/Animated/release/package.json

@@ -0,0 +1,34 @@
+{
+  "name": "react-animated",
+  "description": "Animated provides powerful mechanisms for animating your React views",
+  "version": "0.1.0",
+  "keywords": [
+    "react",
+    "animated",
+    "animation"
+  ],
+  "license": "BSD-3-Clause",
+  "main": "Animated.js",
+  "dependencies": {
+    "fbjs": "^0.2.1"
+  },
+  "scripts": {
+    "build": "gulp"
+  },
+  "devDependencies": {
+    "babel-core": "^5.8.25",
+    "babel-loader": "^5.3.2",
+    "del": "^1.2.0",
+    "fbjs-scripts": "^0.2.0",
+    "gulp": "^3.9.0",
+    "gulp-babel": "^5.1.0",
+    "gulp-derequire": "^2.1.0",
+    "gulp-flatten": "^0.1.0",
+    "gulp-header": "^1.2.2",
+    "gulp-util": "^3.0.6",
+    "object-assign": "^3.0.0",
+    "run-sequence": "^1.1.2",
+    "webpack": "1.11.0",
+    "webpack-stream": "^2.1.0"
+  }
+}