rpartition (instead of partition) #number for github issues/pull, so that we

don't have to specify "#" when we're got a default repo (github.py)

modules/github.py

@@ -40,7 +40,7 @@ COMMENT_ACTIONS = {
     "help": "Set the default github repo for the current channel"})
 class Module(ModuleManager.BaseModule):
     def _parse_ref(self, channel, ref):
-        repo, _, number = ref.partition("#")
+        repo, _, number = ref.rpartition("#")
         if not repo:
             repo = channel.get_setting("github-default-repo", None)