Add json to global template context

just seems like a useful thing to have around...

tailbone/subscribers.py

@@ -27,6 +27,7 @@ Event Subscribers
 from __future__ import unicode_literals, absolute_import
 
 import six
+import json
 
 import rattail
 from rattail.db import model
@@ -82,6 +83,7 @@ def before_render(event):
     renderer_globals['tailbone'] = tailbone
     renderer_globals['enum'] = request.rattail_config.get_enum()
     renderer_globals['six'] = six
+    renderer_globals['json'] = json
 
 
 def add_inbox_count(event):