Addresses issue with parens and certain operators
Only draw passable tiles
Add additional draw steps
Add action to set HUD properties
Remove old helicam enabling
Added actions to scenarios
Merge pull request #386 from virtual-world-framework/passable-tiles-only

Only draw passable tiles
Merge pull request #387 from virtual-world-framework/disable-HUD-until-needed

Disable hud until needed
Clear blockly trace on succesful scenario

Conflicts:
	source/index.js
Merge pull request #388 from virtual-world-framework/clear-trace

Clear blockly trace on succesful scenario
Hook up the new VO sounds and level 2 music.
Delete unused file
Merge pull request #393 from virtual-world-framework/kevin-tweaks

Hook up the new VO sounds and level 2 music.
Merge pull request #394 from virtual-world-framework/fix-paren-blockly-issue

Addresses issue with parens and certain operators
Added alphaTest to hills
Ken McClure:  animated the quadcopter.dae model to fly up 3m for a second or two and then to fly 30m up after that.
Ken McClure:  Update to rover tracks.  Lowered the floating tracks section to be along the ground.  Also updated the rocks and boulder placement near the end track and mini rover position.
Merge pull request #392 from virtual-world-framework/Ken-Art

Ken McClure:  Update to backdrop.dae.  Broke the object into 8 pieces to...
Store terrain object as property on rover - also make wheels VWF objects
Have rover wheels follow the ground