synchronized methods
doesn't crash when dead. NotificationCreator
Bugs: returnpopup nt shown & notis dnt dissapear
Merge remote-tracking branch 'origin/Dev' into bugfix_notifications_majoulf

Conflicts:
	CrayCray/src/se/chalmers/dat255/craycray/activity/MainActivity.java
	CrayCray/src/se/chalmers/dat255/craycray/model/NeedsModel.java
Merge branch 'Dev' of https://github.com/Jonate/Dat255-CrayCray into Dev

Conflicts:
	CrayCray/src/se/chalmers/dat255/craycray/activity/MainActivity.java