spawner
Merge branch 'master' of https://github.com/tpham93/SpaceLetters
spawner
Merge branch 'master' of https://github.com/tpham93/SpaceLetters

Conflicts:
	SpaceLetters/SpaceLetters/Game/World.cs
Merge branch 'master' of https://github.com/tpham93/SpaceLetters

Conflicts:
	SpaceLetters/SpaceLetters/Game/World.cs
Merge branch 'master' of https://github.com/tpham93/SpaceLetters
drone
Merge branch 'master' of https://github.com/tpham93/SpaceLetters

Conflicts:
	SpaceLetters/SpaceLetters/Game/World.cs
drone fixed speed
Merge branch 'master' of https://github.com/tpham93/SpaceLetters

Conflicts:
	SpaceLetters/SpaceLetters/Game/Entity/Drone.cs