Testing the waters with the Animation Manager.
Changed AnimationManager to hold Animation Strips rather than animations.  Otherwise, all sprites would have a pointer to the same animation and wonky stuff would happen.
- Can now load atlases generated from TexturePacker using the TexturePackerParser.

- Animation Manager has been updated accordingly.  It now creates animations based on the AnimationCells, rather than sharing animations.
- Modified split screen demo to show off the cool robot animation instead of another ship
Completed the first run of an animation parser.
Fixed NuGet checkins
SpriteSheetPackerParser
Merge branch 'animation' of https://github.com/combitstudios/fwd into animation

Conflicts:
	src/demos/SplitScreen/SplitScreen/SplitScreen.csproj.Debug.cachefile
First pass at supporting building atlases from animated GIF files
Merge branch 'animation' of github.com:combitstudios/fwd into animation
Updated .ignore file
Minor cleanups
Animated gif is now generating animation data as well, but likely incorrect
Ultra simple parser to load JSON animation cell data into AnimationManager
Cleaning up old library
Merge branch 'master' of github.com:combitstudios/fwd into animation

Conflicts:
	.gitignore
	src/demos/SplitScreen/SplitScreen/SplitScreen.csproj.Debug.cachefile
	src/fwd.sln