New sound for clearing the grid and Added class for GLLockControl.
The GLLockControl class is meant to be simple but this is just a first
attempt and the code needs to be cleaned up.  Also, the code for adding
the lock to the Color HUD needs to be much better -- this is just a
simple hack in for the time being
Actually added the new clear sound file
Merge branch 'master' of http://github.com/gregoryklein/GameOfLife