GraphViewer: Added tests for expanding/collapsing of nodes if communitynodes are inside the graph
GraphViewer: Tests for CommunityNodes and adding edges to them
GraphViewer: Edges are bound to community nodes correctly
GraphViewer: In/Outbound counter for nodes is set correctly even after community joins. All Tests pass on usefull browsers and 99% on IE9
Merge branch 'devel' of github.com:triAGENS/ArangoDB into devel