First version of SharpDoc project.
Update tutorials.md

Fixed links.
Update tutorials.md

Cleanups.
Update main.md

Fixed up welcome message.
Renamed main to welcome.
Ignore the documentation output folder.
Merge branch 'develop' into docs
Updated to Protobuild with documentation generation support.
Added more configurations.
Updated dependencies for SharpDoc.
Added doc generation to build script.
Fixed nant script syntax.
Missed closing the tag.
Added MonoGame style for docs.
Added Android, Ouya, and PSM to doc processing.
Added iOS commented out for now.
Disabled OUYA and Android as the build server has a problem with it.
Fixed link and text colors.
Changed to html.
Set external link target.
Removed starting headings.
Fixed up clean to deal with content and docs.