Added 'repr' Jinja2 filter.

This can help with debugging, for example by showing the difference between
a string ID and an ObjectID.

pillar/web/jinja.py

@@ -154,5 +154,6 @@ def setup_jinja_env(jinja_env):
     jinja_env.filters['gravatar'] = pillar.api.utils.gravatar
     jinja_env.filters['markdown'] = do_markdown
     jinja_env.filters['yesno'] = do_yesno
+    jinja_env.filters['repr'] = repr
     jinja_env.globals['url_for_node'] = do_url_for_node
     jinja_env.globals['session'] = flask.session