Added Rex Class

did minor modification to platformer.cs as well. There will be minor
merge conflict
changed literal values on rex.cs

added a scale property in celAnimationPlayer.Draw();
Merge remote-tracking branch 'origin/christopher' into katdev

Conflicts:
	Platformer_March25/Platformer/Content/PlatfomerContent.contentproj
	Platformer_March25/Platformer/Platformer.cs
	Platformer_March25/Platformer/Platformer.csproj.Debug.cachefile

Merging chris and kats branches for the first time