Removed async extensions.
Added UI thread marshaling to the GetSelection calls which fail otherwise.
Added tests that ensure we can retrieve MEF components from service locator.
Yeah, this is too big a commit :(
Fixed reference to intellisense assembly for vs2012 and vs2013
Added unit test for fixed fallback service locator behavior when primary fails.
Unified behavior for inconsistent behavior of VSMEF between VS2010 and VS2012/13.
Added tests that ensure consistent behavior across vs2010/12/13 global service provider.