GraphViewer: NodeShaper now supports colouring by attribute value
GraphViewer: EdgeShaper now supports colouring by attribute value
GraphViewer: Added tests for Node-Colour change controls
GraphViewer: NodeShaper now creates UI elements to change the colouring
GraphViewer: Node colouring added to the demo.html. Decided to forcefully set the TextColour to black, as it inherits the user defined colour-scheme otherwise and this gets unreadable quite fast
GraphViewer: Implemented test for edge colouring dialogs
GraphViewer: Implemented UI Dialogs for edge colouring
GraphViewer: EdgeColouring tested in demo.html, again the label is set to black forcefully
GraphViewer: Enlarged the Arrow Pointer, has to be changed to be relative to nodesize
Merge branch 'devel' of github.com:triAGENS/ArangoDB into devel