Merge pull request #2 from zombiepaladin/misc_assets

music
Added sound object and more work on game_events.js

There is now a pause screen although it's quite buggy. Still need to
implement sound object into game. Also, need some music and sound
effects to test it.
Removed music from repository. Please don't add it until you need it for your level. The music that was here can now be found at http://people.cis.ksu.edu/~djmaas/cis580music/