extend the story screen music
Actually play the new intro screen loop.
Merge pull request #212 from virtual-world-framework/story-music-extended

Just merging this - it's pretty safe.
Ken McClure: Update to rock_2x3.dae Brett asked that I rotate it to match the others.
Ken McClure: adding two new place-able objects that brett mentioned having.  I added in the rubble pieces to the crater.
Ken McClure: adding new blank version of terrain.
Added gridObstacle component
Added rotation logic
Added obstacle components
Added new rubble crater obstacles.
Made crash pod a gridObstacle
Add editor application
Start adding grid tiles to editor
Start working on user interface for editor