Example fix, test script, and some refactoring

- The test script just does an eslint check. (Closes #121)
- Refactored JS code to pass the check.
- Fixed VideoPlayer example. (Closes #117)
  - Updated package.json to use local react-native-video in a simple manner.
  - Added shared scheme for target.
  - Updated poject settings.
  - Now using react-native 0.18.1.

VideoResizeMode.js

@@ -1,11 +1,7 @@
-'use strict';
+import keyMirror from 'keymirror';
 
-var keyMirror = require('keymirror');
-
-var VideoResizeMode = keyMirror({
+export default keyMirror({
   contain: null,
   cover: null,
   stretch: null,
 });
-
-module.exports = VideoResizeMode;