Ken McClure: Update to scene.dae and terrain.jpg and terrain_spec.jpg.  Added some more debris to the scene.  Added some in the center path to block player path.  Also added rocks and debris to the right side path to block some areas.
Cleaning up YAML to remove unnecessary sound properties
Rover voice changed to male
Created rover sounds layered sound definition.
Attempting to abstract away stopping sounds with no instance ID

Conflicts:
	source/rover.js
Wind and gameplay play on start again.
Hacky way to stopSound using triggers by retaining sounds in the soundManager
No need to provide sound instanceID anymore. Will stop all sounds if only soundName is provided.

Conflicts:
	source/marsGameSound.js
	source/marsGameSound.vwf.yaml
Merge pull request #126 from virtual-world-framework/sound-events

Sound events
Ken McClure: Update to scene.dae and terrain.jpg and terrain_spec.jpg.  Added some more debris to the scene.  Added some in the center path to block player path.  Also added rocks and debris to the right side path to block some areas.
Ken McClure: Update to scene.dae and update to rubble textures.  Retextured rubble to look more like the crash pod.  Rusted burnt textures blended in too well with the rocks and terrain.
KM: fixed issue with spec and nrm not showing up
Merge pull request #123 from virtual-world-framework/Ken-Art

Ken McClure: Update to scene.dae and terrain.jpg and terrain_spec.jpg.  ...
Move the scenario files into their own directory.