Replacing ThirdParty/Lidrgren.Network/ contents with most up-to-date (REV#391) from repository http://lidgren-network-gen3.googlecode.com/svn/trunk/Lidgren.Network
MonoGame should now build correctly (at least Windows platform has been tested) against newest version of lidgren.
Updating lidgren project definition for newest version of lidgren.
Some properties and methods containing the string Endpoint have been renamed to EndPoint in this version of lidgren.
Disabling generation of lidgren project for PSMobile platform.
Disabling lidgren project generation for PSMobile (for real this time).
Revert "Disabling generation of lidgren project for PSMobile platform."

This reverts commit 23f4d16426696de4d238be369f7a9048b5e9d611.
Disabling MonoGame.Framework.Net project generation for PSMobile (since it references Lidgrin).
Merge pull request #3223 from SickheadGames/LidgrenUpdate

Update Lidgren to REV#391
Add code to disable the "Open Recent" menu if it contains 0 items.
Merge pull request #3244 from dneelyep/Issue3122

Add code to disable the "Open Recent" menu in Pipeline.exe if it contains 0 items.
Fixed manifest for WP8.1 template.
Added new tutorial link.
Added more detailed instructions on editing docs.
Tweaked the forking instructions a bit.
Merge pull request #3247 from SickheadGames/docs2

Small Doc Update
New Protobuild fixing WP8.1 certification and ConfigurationMapping.
Better error message on missing MGCB.exe.
Make <MonoGameContentBuilderExe> path overloadable.
Add better error message on missing/incorrect <MonoGamePlatform>.
Added <MonoGameContentBuilderExe> to all templates to hint that it can be overloaded.
Fixed bad template parameters.