[Toolkit.Graphics] Fix issue #351.  Resize Window event  was not triggered when GameWindow.AllowUserResizing=true
[SharpDX] Fix issue #357. Fix comments for X/Y/Width/Height
[Samples] Fix issue #360
[Toolkit.Game] Fix samples to unload dynamic content. Make sure UnloadContent is callable only if LoadContent was called.
[DirectInput] Fix issue #352. Rename UpArrow to Up and remove invalid mappings.
[SharpDX] Fix issue #334. Add Matrix3x2.Invert method.
Merge pull request #1 from sharpdx/master

Updated to 6051a19dcb8c57ea4d0e27a3d1e043244c54ab6b