Merge branch 'nd/rebase-forget'

"git rebase" learned "--quit" option, which allows a user to
remove the metadata left by an earlier "git rebase" that was
manually aborted without using "git rebase --abort".

* nd/rebase-forget:
  rebase: add --quit to cleanup rebase, leave everything else untouched

Documentation/git-rebase.txt

@@ -12,7 +12,7 @@ SYNOPSIS
 	[<upstream> [<branch>]]
 'git rebase' [-i | --interactive] [options] [--exec <cmd>] [--onto <newbase>]
 	--root [<branch>]
-'git rebase' --continue | --skip | --abort | --edit-todo
+'git rebase' --continue | --skip | --abort | --quit | --edit-todo
 
 DESCRIPTION
 -----------
@@ -252,6 +252,11 @@ leave out at most one of A and B, in which case it defaults to HEAD.
 	will be reset to where it was when the rebase operation was
 	started.
 
+--quit::
+	Abort the rebase operation but HEAD is not reset back to the
+	original branch. The index and working tree are also left
+	unchanged as a result.
+
 --keep-empty::
 	Keep the commits that do not change anything from its
 	parents in the result.