Song.FilePath now an absolute path on desktop and Windows Store systems.
Song.Position and Song.FilePath are now internal as they are not part of XNA.
Added song support for Windows DX desktop builds.
Merge branch 'develop3d' into windesktop
Added api docs for KeyboardState.cs and Keyboard.cs.
Also started fixing api docs for Keys.cs.
Finished API docs for Keys.cs.
Re-worded API docs for keys.cs, keyboardstate.cs and keyboard.cs.
Merge pull request #1286 from raistlinthewiz/keyboard-docs

Added code documentation for Keys.cs, KeyboardState.cs and Keyboard.cs.
Song.Duration property implementation

Reads the duration from xnb file while ContentManager is loading the
song
Merge pull request #1288 from aghajani/skywave

Song.Duration property implementation
Merge branch 'windesktop' of github.com:SickheadGames/MonoGame into windesktop
Merge pull request #1272 from SickheadGames/windesktop

Song Support for WinDX