Merge with develop and Updated Version numbers to be 2.5.0.0
Added instructions about getting the associated submodules.
merge with develop for 2.5.1 release
Merge pull request #531 from CartBlanche/master

Merge for 2.5.1 Release, from develop
Merge branch 'master' into master_v3.0.0.0
Merge pull request #1367 from tomspilman/master

[Branch Migration] Master
fix GameCore2D.cs bug
Merge remote-tracking branch 'remotes/upstream/master' into develop3d

Conflicts:
	Installers/Windows/MonoGame.nsi