remote-hg: push to the appropriate branch

Signed-off-by: Felipe Contreras <felipe.contreras@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

git-remote-hg

@@ -626,6 +626,10 @@ def parse_commit(parser):
     if merge_mark:
         get_merge_files(repo, p1, p2, files)
 
+    # Check if the ref is supposed to be a named branch
+    if ref.startswith('refs/heads/branches/'):
+        extra['branch'] = ref[len('refs/heads/branches/'):]
+
     if mode == 'hg':
         i = data.find('\n--HG--\n')
         if i >= 0: