Implemented NormalizedByte4.
Added tests for NormalizedByte4.
Fixed bad formatting.
Implemented NormalizedByte2.
Merge pull request #2205 from SickheadGames/NormalizedByte

Implemented NormalizedByte4/Byte2
Merge branch 'develop' of git://github.com/mono/MonoGame into mg-sdl2-final
Update SDL2 csproj for develop