GraphViewer: Added the Adapter Menu to the interface
GraphViewer: The layouter is now checked for useful default values
GraphViewer: Implemented Menu functions for Layouter
GraphViewer: Added a spec that the layouter menu is generated by the GraphViewerUI
GraphViewer: Layouter is now accessible
GraphViewer: LayouterMenu is now created by the GraphViewerUI
GraphViewer: Improved optics of layout buttons, they are now encapsulated in their own little div world
Merge branch 'devel' of github.com:triAGENS/ArangoDB into devel