[package.json] cleanup
- restrict to ios+android
- distinguish between dev and prod app keys/secrets
- remove superfluous descriptions
- gcmSender for android only
[AndroidManifest.xml] removed PushWorkerService
no longer required with UA Android lib ver. 3.0.0+.
[AndroidManifest.xml] removed inadvertently added permissions
so many that the user would basically freak out..
[AndroidManifest.xml] detect when a new GCM is needed
commented out for now as i'm not sure it really is necessary for cordova apps