Simple pushback when enemy hit by bullet.
Abstract out Player to Human Successfully
adding of start options button with list of controls
press 'backspace' to pause and unpause game
added 'tips' label to show tips, tells player how to pause
added ammo to map, made bullets faster, bullets are destroyed when hit ammo
Enemies abstracted out.
Enemies can now shoot at player depending on distance.
Enemies now shoot at player with timing.
Change enemy positions on map.
Human merge
Merge remote-tracking branch 'upstream/master'
rocket redo