Started on Observer pattern

Will be used to notify changes in the LaunchItemProvider.
Merge remote-tracking branch 'origin/master'

Conflicts:
	DrawCut/src/main/java/net/hath/drawcut/Observer.java
	DrawCut/src/main/java/net/hath/drawcut/Subject.java
	DrawCut/src/main/java/net/hath/drawcut/ui/fragment/LaunchItemListFragment.java