GraphViewer: NodeReducer should now pick communities as desiered, however some illeagal community joins are produced right now, to be fixed
GraphViewer: Gave Zoommanager a callback to inform the GraphViewer about NodeLimitChanges
GraphViewer: Added tests for graphViewer to accept NodeLimit Callback and to propagate it to the Adapter
Merge branch 'devel' of github.com:triAGENS/ArangoDB into devel
GraphViewer: Started implementing the Communication between ZoomManager, GraphViewer and the Adapter
Merge branch 'devel' of github.com:triAGENS/ArangoDB into devel