Login with persona
Fix tests
Add a test for failed login
Presence: return a 401 if the assertion's verification failed
Worker: fix the error handling for #sendAjax
README: add the AUDIENCE for the runserver command
Fix worker tests
Merge branch 'master' into persona-login
display proper media icons for incoming & outgoing calls
Address code review comments
Server: logs errors in the send method

Instead of crashing the server when we try to send data via a non existant
websocket, we log an error and do nothing.
Server: add a test for User#send errors
Fix a jshint
fixed tested media constraints were not updated data
sync with master
Merge pull request #201 from tOkeshu/log-ws-send-errors

Server: log errors in the send method
Tests: add a XXX comment for #_verifyAssertion
Worker: add a test for #sendAjax
verifyAssertion: set the encoding of response
Force logout when the login failed