[SharpDX] Added converstion operators between Rectangle and RectangleF structures.
[Toolkit.Graphics] Adjusted SpriteBatch.Draw methods accoding to added Rectangle-to-RectangleF conversions and reordered methods for better readability.
Merge branch 'master' of https://github.com/sharpdx/SharpDX

Conflicts:
	Source/Toolkit/SharpDX.Toolkit.Graphics/SpriteBatch.cs