Update to the git hook to make working with the authz_policy easier i…

…n the future.

extras/git-hooks/post-receive

@@ -38,6 +38,7 @@ def _build_commit(rev):
             total=commit.stats.total,
         ),
         rev=rev,
+        repo=repo_name,
         branch=branch,
     )
 
@@ -55,6 +56,7 @@ for commit in commits:
         continue
 
     fedmsg.publish(
+        # XXX - Expect this to change to just "receive" in the future.
         topic="receive.%s.%s" % (repo_name, commit['branch']),
         msg=dict(commit=commit),
         modname="git",