Swapped DefaultTargets and ToolsVersion to match standard projects.
Added missing import for Win8.
Fixed VisualStudioVersion conditional.
Trying some things to fix Windows 8 builds.
Fixed solution for Windows 8 builds.
Fixed target for PSM.
Some more PSM fixes.
Set pipeline assemblies to "Any CPU".
Fixed MonoDevelop.MonoGameContent projects to use "Any CPU".
WindowsPhone was not setting the Release x86/ARM configurations as buildable.
WindowsPhone now gets the Visual Studio 2012 header.
Added support for user defined project GUIDs.
Restored the original project GUIDs.
Incorporate changes into Protobuild upstream
Applied changes from latest graphics and audio refactors.
Fixed typo.
Make sure only the platforms we support can be generated.
Latest protobuild executable.
Merge remote-tracking branch 'origin/develop' into protobuild

Conflicts:
	MonoGame.Framework/MonoGame.Framework.Android.csproj
	MonoGame.Framework/MonoGame.Framework.Linux.csproj
	MonoGame.Framework/MonoGame.Framework.MacOS.csproj
	MonoGame.Framework/MonoGame.Framework.Ouya.csproj
	MonoGame.Framework/MonoGame.Framework.PSMobile.csproj
	MonoGame.Framework/MonoGame.Framework.Windows.csproj
	MonoGame.Framework/MonoGame.Framework.Windows8.csproj
	MonoGame.Framework/MonoGame.Framework.WindowsGL.csproj
	MonoGame.Framework/MonoGame.Framework.WindowsPhone.csproj
	MonoGame.Framework/MonoGame.Framework.iOS.csproj
Removed old PSM audio class.
Removed duplicate file from Linux project.
Added AudioUtil to PSM.
Merge pull request #2249 from SickheadGames/protobuild

Protobuild