Context shoud be dict on render_email_template()

template.Context intance is no longer accepted

orchestra/utils/mail.py

@@ -10,12 +10,9 @@ def render_email_template(template, context):
     Renders an email template with this format:
         {% if subject %}Subject{% endif %}
         {% if message %}Email body{% endif %}
-    
-    context can be a dictionary or a template.Context instance
+
+    context must be a dict
     """
-    if isinstance(context, dict):
-        context = Context(context)
-    
     if not 'site' in context:
         from orchestra import settings
         url = urlparse(settings.ORCHESTRA_SITE_URL)