config,completion: add color.status.unmerged

Reported-by: N"Mladen B." <mladen074@gmail.com>
Signed-off-by: NMichael J Gruber <git@drmicha.warpmail.net>
Signed-off-by: NJunio C Hamano <gitster@pobox.com>

Documentation/config.txt

@@ -957,9 +957,11 @@ color.status.<slot>::
 	`added` or `updated` (files which are added but not committed),
 	`changed` (files which are changed but not added in the index),
 	`untracked` (files which are not tracked by Git),
-	`branch` (the current branch), or
+	`branch` (the current branch),
 	`nobranch` (the color the 'no branch' warning is shown in, defaulting
-	to red). The values of these variables may be specified as in
+	to red), or
+	`unmerged` (files which have unmerged changes).
+	The values of these variables may be specified as in
 	color.branch.<slot>.
 
 color.ui::

contrib/completion/git-completion.bash

@@ -2014,6 +2014,7 @@ _git_config ()
 		color.status.changed
 		color.status.header
 		color.status.nobranch
+		color.status.unmerged
 		color.status.untracked
 		color.status.updated
 		color.ui