don't open a popup for dragged-out group actors
turn actorGroup into normal actor when removing the last actor
remove unneeded stuff
introduce DraggableDroppableView
improve drag'n drop (dropClasses, more checks...)
prevent dragging when creating a group
rename drop-function
fix socket warnings in Firefox
react to remote actor groups and fix socket
Actor + Actor = ActorGroup <3
finish actor-creation -> including realtime stuff
fix problems with the pickOut-method
remote actorgroup drop-out
add group details
details for group and group actors
destroy all included actors when destroying a group
Merge branch 'master' into f-actor-groups-features

Conflicts:
	app/initialize.js
don't allow users to lock an already locked model
add failing request on version conflicts and locking problems
add out of sync error message