Merge pull request #130 from virtual-world-framework/Ken-Art

Ken McClure: update to scene.dae....added in smalls rocks down the canyo...
Added graph plane

Conflicts:
	index.vwf.yaml
Default the graph to invisible
Hide grid on tab switch
Renamed gridScale to graphScale
Added grid toggle button
Adjusted graph and line
- Update the maze to match what Juan and I discussed.
- Remove a bogus error message.
Merge pull request #134 from virtual-world-framework/maze_refinement

- Update the maze to match what Juan and I discussed.
Merge pull request #135 from virtual-world-framework/graph-updates

Graph updates
Ken McClure: adding rover track textures
Ken McClure: Adding rover track textures