Adding splash screen with gif.
Merge branch 'master' of https://github.com/borisv13/SpaceInvaders.git
Created newer SplashScreen with animated gif, integrated it into
SpaceInvaders.java program.  SplashScreen.java has a main, and a test
function called ShowandExit.  Also, updated SpaceInvaders with a
gameloop that doesn't need to use Thread.Sleep.
Another commit of the splashscreen
Merge branch 'master' of https://github.com/borisv13/SpaceInvaders.git

Conflicts:
	SpaceInvaders/src/spaceinvaders/SpaceInvaders.java