Added VS2012 Project file. Merged from upstream.

Signed-off-by: Ken 'Minalien' Murray <minalien@gmail.com>
AnimatedSpriteBehavior implementation is complete. Utilizes a single-level animation sequence (see Assets/Textures/Animation Test/Running.png) - Note that this texture MUST BE REMOVED and not distributed with this project - it is here only so that the animation system can be tested. Once we have art assets ready, we can use one of those as the test/sample image.

Signed-off-by: Ken 'Minalien' Murray <minalien@gmail.com>
Implemented IsFlipped property on AnimatedSpriteBehavior.cs to determine if the sprite should be flipped horizontally.

Signed-off-by: Ken 'Minalien' Murray <minalien@gmail.com>
Merge pull request #6 from Minalien/master

Animation System merged