Added a start game menu and cleaned up enemy sprite edges.
Removing all my files to be replaced by Steven's.

Conflicts:
	Cosmic Escape/Cosmic Escape/Game1.cs
	Cosmic Escape/Cosmic EscapeContent/Cosmic EscapeContent.contentproj
Merge branch 'slave' of https://github.com/stevenng308/Cosmic-Escape into slave

Conflicts:
	Cosmic Escape/Cosmic Escape/Camera.cs
	Cosmic Escape/Cosmic Escape/Cosmic Escape.csproj
	Cosmic Escape/Cosmic Escape/Game1.cs
	Cosmic Escape/Cosmic Escape/GameObject.cs
	Cosmic Escape/Cosmic EscapeContent/platformsheet.txt