Version: Releasing version 2.7.2
updated `NotificationHandler` to take advantage of the updated `NotificationProvider` interface.
Merge branch 'master' of https://github.com/DroidPlanner/droidplanner into feature_android_lib
Merge branch 'feature_android_lib' of https://github.com/ne0fhyk/droidplanner into feature_android_wear

Conflicts:
	Android/src/org/droidplanner/android/notifications/NotificationHandler.java