Player can shoot very fancy :)
Projectiles have now a lifetime
Merge branch 'master' of https://github.com/tpham93/SpaceLetters

Conflicts:
	SpaceLetters/SpaceLetters/Game/Entity/Player.cs
	SpaceLetters/SpaceLetters/Game/Entity/Projectiles.cs
	SpaceLetters/SpaceLetters/Game/Weapon/Cannon.cs
Merge fix