* Fix GCM dependency

Recent GCM modifications made some breaking changes which makes the build fail. Avoid that by using a fixed GCM version,

* Accept newer GCM 9.0 versions

Add required version of cordova ios required since v1.6

* implemented clearBadge for Android

* moved clearbadge call to an earlier point to make it independent of the success of the sharedpreferences commit call

Add mention in doc that registrationId will be prod/sandbox APNS according to how the app was built (#1012)

https://developers.google.com/android/guides/releases

Google Play services updated to 9.0.1
The Google Play services version 9.0.1 release is now available. This release fixes the following issues with the version 9.0.0 release:

Fixes a class change compilation error with ContextCompat.getNoBackupFilesDir().

Issue #795: coldstart flag always set to true if the app has been opened through an alert, on ios 9.3.1, plugin version 1.6.2 cordova 6.1.0 cordova ios 4.1.1

Issue #824: JS error in Success callbackId: PushNotifiation###.. whenever a notification is sent to the device

* Added support of HTML tags to title, message and summary text.

* Bugfix for NullPointerException

* Remove debug console output