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.
Fixed non-working $targetnametoken$ template parameters.
Merge pull request #3248 from SickheadGames/templates2

Templates and Protobuild Fixes
Added .NET solution for the WindowsPhone 8.1 platform
Merge pull request #3250 from DDReaper/WindowsPhone81.NET_update

Added .NET solution for the WindowsPhone 8.1 platform
Made the retry a little smarter when MediaFactory.GetService fails.
Made previous fix work for VideoPlayer and MediaPlayer fixes #2620
Fixed bug in previous checkin. Now passes correct  _session to the method. Also removed unused Guids from MediaPlayer as they are now only used in VideoPlayer
Revert "Fixed bug in previous checkin. Now passes correct  _session to the method. Also removed unused Guids from MediaPlayer as they are now only used in VideoPlayer"

This reverts commit 5d46e00855b061220e078293386cf172d6d8aba7.
Fixed bug in previous checkin. Now passes correct  _session to the method. Also removed unused Guids from MediaPlayer as they are now only used in VideoPlayer