Ensure final slash in default janus url (better for proxying)
Ensure final slash in default janus url (better for proxying)

 * Looks like proxy_wstunnel in some versions of Apache works better
   if the url really ends with a slash

jangouts/jangouts,jangouts/jangouts,aitnasser/jangouts,aitnasser/jangouts,aitnasser/jangouts,jangouts/jangouts,ChrisBr/jangouts,jangouts/jangouts,ChrisBr/jangouts,ChrisBr/jangouts,aitnasser/jangouts,ChrisBr/jangouts