Move initial node expanding from client to server

Separate toggle and clientResized rpc calls

Change-Id: I60d71515fc371ce81370fe94a7b9f57ab6311fc1
Move model and repository out of controller

Change-Id: I3235c3d1dee38a8a065c96e94d964a66c5da6bb8
Add more layout engines examples

Change-Id: I28f4ac71b17d2522502988124a026a344fc27b08
Move layoutEngineModel into layoutEngine

Change-Id: Id7a386b8c834779d027c58ebe7b70788c300b288