Added weapon texture to the player
added centerX and centerY to getARmDireciton
Revert "added centerX and centerY to getARmDireciton"

This reverts commit da28e67822ff0db284b75ac17b655e71dd5ec846.
started to implement bullets
Merge branch 'master' of https://github.com/LudumRolfing/LD28 into feature/weapon

Conflicts:
	src/Player.lua
Merge branch 'feature/weapon' of https://github.com/LudumRolfing/LD28 into feature/weapon

Conflicts:
	src/Entity.lua
	src/Player.lua
	src/World.lua
applying some awesome forces to bullets
optimized bullets and spawn position of bullets
Tried to fix the problem with bullets-angle, but it failed. hoping teddy will fix it
corrected some mysterious failures with angles
Merge branch 'master' of https://github.com/LudumRolfing/LD28 into feature/weapon
Fixed some magic number bugs
Fixed force of bullets
set gravity of bullets to 0
corrected weird bug with up and down