* feat - introduce the plugin wrapper for code-push and type definitions
* feat(code-push) - change the signature of the methods to return Promise & decorate them with Cordova decorator
* fix(code push) - in sync method call the native method
* fix(code-push) : use decorator on syc to mark it as an observable / add sample usage
* docs(code-push) : add the link to the sample repository
* fix - merge errors
* fix(code-push) : add description field on CodePush class / remove not needed IWindow interface declaration