Merge pull request #1173 from nkast/nkastBranch

DepthStencilState was not setting ReferenceStencil
Added a clean target and the content processor target to the build script
Updated the installer to include the new pages
Remvoed Xamarin page from the installer
MonoGame 3.0 Release 2013-01-11
Fixed Installer to run OpenAL silently.
Fixed the Linux and Windows Templates to link to SDL and SDL_mixer.dll (for linux)
Fixed some of the registry entries for the installer
added SDL_mixer.dll
Provided additional information in (re)thrown exceptions.
Merge pull request #1177 from Qbit86/develop3d

Provided additional information in (re)thrown exceptions.
Merge remote-tracking branch 'upstream/develop3d' into nkastBranch