Change to Iframe mode

1) add listener in loginCtrl to get push notification regid and FB
accessToken
2) listen to message.notification in gameCtrl
3) move push notification register process from gameCtrl to
phonegapIframe_phonegapCode.js

iframe.js
1) iframe.js is executed in platform/index.html which send
phonegapIframe_phonegapCode.js to phonegap

phonegapIframe_phonegapCode.js
1) executed by phonegap
2) register for push notification and send regid to platform/index.html
3) send message.notification to platform/index.html when getting
notification
4) get FB accessToken and send it to platform/index.html