Added method to check for Google Play Services APK.
Updated layout and string values.
Did some more updates to the layout.
Added fields. Filled in logic if Google Play Services is available.
Methods for getting the app's current registration ID if it exists.
Method to get the application's current version.
Method that registers the device/app with GCM.
Stub for sendRegistrationIdToBackend().
Method that stores the device's registration ID in the app's shared preferences.
onClick stub.
onReceive() method.