Merge branch 'ph/send-email'

* ph/send-email:
  git send-email: ask less questions when --compose is used.
  git send-email: add --annotate option
  git send-email: interpret unknown files as revision lists
  git send-email: make the message file name more specific.

t/t9001-send-email.sh

@@ -292,4 +292,12 @@ test_expect_success '--compose adds MIME for utf8 subject' '
 	grep "^Subject: =?utf-8?q?utf8-s=C3=BCbj=C3=ABct?=" msgtxt1
 '
 
+test_expect_success 'detects ambiguous reference/file conflict' '
+	echo master > master &&
+	git add master &&
+	git commit -m"add master" &&
+	test_must_fail git send-email --dry-run master 2>errors &&
+	grep disambiguate errors
+'
+
 test_done