Add Bitmap and Image support using Image IO.  This is the first pass with more to do.
Fix Pen when using Brush constructor.  The width was not being set.
Bring MTBitMapTests inline with BitmapTests
Add Tag property to Image class.
Add Image and Bitmap save functions using Image IO.
Fix problem loading and drawing GrayScale with no alpha images.
TextureBrush implementation.  Not complete but works for all WrapModes except Clamp.  Added TextureBrushTest example for Mac OS for Testing.
Add MTTextureBrushTest.  Fix drawing orientaion for iOS.
Add implementation for Bitmap(Image, Size).
Update samples to use Bitmap(Image, Size) for test.
Add support for TextureBrush Matrix Transforms.
Add tiled Ellipse to test Transform behavior.
Merge pull request #6 from kjpou1/master

Implement Bitmap and Image using Image IO. TextureBrush