Ran macro to clean out non used using statements and to sort the using statements.

Just to be clear. Macro just calls projectItem.Document.DTE.ExecuteCommand("Edit.RemoveAndSort") on every project item that is cs file.
Merge remote-tracking branch 'origin/master' into feature/DistSettings

Conflicts:
	GitCommands/Settings/AppSettings.cs
	GitExtensionsTest
	GitUI/GitUICommands.cs