Added missing Album.GetThumbnail and GetAlbumArt to platforms where it isn't implemented (throws NotImplementedException)
Fixed up MipmapChainCollection to supported fixed sizes.
Added Texture3DContent and TextureCubeContent.
Added to the TextureContent tests.
Fix to obey fixed sized MipmapChainCollection.
Refactor of GraphicsUtil.Resize() to filter better.
Added TextureProcessorTests.ResizePowerOfTwo() test.
Merge pull request #3091 from SickheadGames/mips

More TextureContent Improvements
Merge pull request #3086 from SongArc/feature/albumart_fix

Fixed missing GetThumbnail and GetAlbumArt
Introducing some delay into shutdown to more reliably process the WM_QUIT.
Merge pull request #3094 from SickheadGames/testsfix

Fix Visual Unit Test Shutdown
Add a message explaining ProjectGuids to the definition files
Merge pull request #3095 from hach-que/notice

Add a message explaining ProjectGuids to the definition files
Merge branch 'develop' of http://github.com/mono/MonoGame into develop