Merge pull request #14 from thefiddler/master

Update OpenTK to 1.1.2
Latest CppSharp from 3d39b6258907265183d6177ab5ab55a1dbdbcd62.
Merge pull request #15 from SickheadGames/cppsharp

CppSharp Update
Added binaries for ffmpeg.
Merge pull request #16 from SickheadGames/ffmpeg

Added binaries for ffmpeg.
Moved MojoShader stuff into its own folder.
Updated MojoShader for Windows 64bit.
Removed old libglsl optimizer which we don't use.
Merge pull request #17 from Mono-Game/mojo

Updating MojoShader
Updated to OpenTK 1.1.3

Fixes issues https://github.com/mono/MonoGame/issues/2686 and
https://github.com/mono/MonoGame/issues/2711

May affect issue https://github.com/mono/MonoGame/issues/2664