Giving InputSources the World.lua object.
Merge branch 'master' of https://github.com/LudumRolfing/LD28

Conflicts:
	src/World.lua
Changed Entity.world to be our own class.
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