Ken McClure:  Update to rover tracks.  Adjusted them 1m in the y axis.  Also updated the crash furrow where the rover first drives into.  I made it flatter and smoother for the rover to drive into.
Ken McClure:  Update to rover tracks.  Adjusted the second and third sections to be lower 1m in the y axis
Merge pull request #327 from virtual-world-framework/Ken-Art

Ken McClure:  Update to rover tracks.  Adjusted them 1m in the y axis.  ...
Start adding main menu

Conflicts:
	source/index.js

Conflicts:
	index.vwf.html
Added overlay
Play intro video after play game is clicked

Conflicts:
	source/index.js
Cleaned up render switching

Conflicts:
	source/index.js
Made main menu a scenario

Conflicts:
	index.vwf.yaml
Cleaned up code

Conflicts:
	index.vwf.html
Fixed version css
Fixed spacing in utils.js