Knockback Functionality

Basic knockbacks with the sword guys- they only move backwards away from
the player; they do not move up or down yet. Also, there is a knockback
symbol identifier thingymajigger that says "Pow" and displays where the
bullet dies. NOTE THAT I MODIFIED ONE OF DEVEN'S SCRIPTS WITH DEVEN'S
PERMISSION IN ORDER TO MAKE THE POW SPAWN WHERE THE BULLET DIES. Also
added a Pow Prefab to the game assets folder.
Merge remote-tracking branch 'upstream/master'
Backtrack

I reverted back to the one that existed before I merged with the current
master because the current master screwed up my scene!
Enemy Bullet damage

Enemy bullets now damage the player 100% using the "Hurt" function.
SwordGuy Jumps back! Finally!

The Sword Guy now jumps back when hit and is invinsible when in the air.
Merge pull request #18 from ScrambledEgge101/master

End of Day March 13, 2014