[SharpDX] Fix ColorBGRA.SmoothStep()
[SharpDX] Add Lerp() and SmoothStep() to Matrix3x2
[SharpDX] Clean up MathUtil
Removed unnecessary using directive
Merge branch 'more_lerp' of https://github.com/shoelzer/SharpDX into pr121
Merge branch 'master_integration' of https://github.com/shoelzer/SharpDX into pr122
[SharpDX] fixed compilation of MathUtil
Merge branch 'patch-1' of https://github.com/demot/SharpDX into pr123
Merge branch 'master_integration' of github.com:sharpdx/SharpDX into master_integration