refactored initialisers to use gcd
Merge branch 'master' of github.com:Catrobat/Catty into hotfix/issue#251

Conflicts:
	src/Catty/ScenePresenterViewController.m
fixed memory leak when restarting a scene, refactoring
changes starting scene
minor changes
Merge branch 'master' of github.com:Catrobat/Catty into hotfix/issue#251

Conflicts:
	src/Catty/iPhone.storyboard
restart bug fix
minor changes
fixes restarting scene
added nsmaptable to broadcastwaithandler
Merge branches 'hotfix/issue#251' and 'broadcast-wait-issue' of github.com:Catrobat/Catty into hotfix/issue#251
fixed crash dismiss scene with broadcastwait
refactoring presenting and init scene vc
restart und play scene fix
minor changes
misc fixes
merged issue#300 fixes
scene vc changes
scene vc fixes
minor changes