added a way to get MainActivity from the game thread so that we can access run an alert dialog on the ui thread, now high scores can be entered.
added explosion animation for ship, still not appearing just yet though
Merge branch 'master' of https://github.com/Kautiontape/WarpDriveExtreme

Conflicts:
	src/edu/umbc/teamawesome/warpdriveextreme/GameThread.java