Added Doxygen-based code documentation for the XNA4 port

Hopefully this will help Rhys and others, self included, out a lot.
Merge pull request #112 from ZackCDLVI/XNA4-attempt-400

Added Doxygen-based code documentation for the XNA4 port
Revert "Added Doxygen-based code documentation for the XNA4 port"

This reverts commit f3bdb8063457b7270cabbbf2b2ed859fe5ffc283.
Added README for libs.
Upgraded servers to VS2013
Merge pull request #11 from Afr0/XNA4-attempt-400

Hotfix 12212014-xna4