Added a Menu and pause menu

It also includes credits and How to play.  There are new scenes, so to
make it more organized I made a scenes folder.
Merge branch 'master' into sean

Conflicts:
	Assembly-UnityScript-vs.unityproj
	Assembly-UnityScript.unityproj
	Assets/Scenes/Qbert_1.unity
	Assets/qbert_LEVEL1.3dm.rhl.meta
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	Library/ScriptAssemblies/Assembly-CSharp.dll.mdb
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