As far as I know this code works as advertised other than two bugs I
have discovered:
	-If you rotate the firefly piece at the bottom of the board you can get
	an array out of bounds error at line 348 of the gameboard code.
	-Even when given -11, the speedupby method will not slow down.
Merge branch 'master' of https://github.com/robblamb/VBTetris.git
Fixed firefly piece errors.
Merge branch 'master' of https://github.com/robblamb/VBTetris.git
Merge branch 'master' of https://github.com/robblamb/VBTetris.git
Just updating to stashed changes.  Please email me if Math.random still
appears as random number generator in powerupselector.