Merge pull request #18 from himedlooff/master

Adds game over sound and adds sound attribution.
fixed health bug
Merge pull request #19 from himedlooff/master

images
forgot
Merge branch 'master' of https://github.com/RyanSUP/gb_game
Merge pull request #20 from himedlooff/master

Adds image to shield.
player and ghost image added
buster image flips to direction he is moving in.  started setting up beam to come from gun
Spaces out functions.
Updates health and shield bar visuals and updates death screen text color.