Update imports from python_bigbluebutton library.
Inform the user that is subscribed to the meeting.
Reset form if valid before render.
Allow deleting meetings in database and on bigbluebutton
server from meetings view, because of that, this view is
only accessible for logged users.
Create recorded attribute to choose if the meeting will
be recorded or not.
Pass record argument to createMeeting method.
Add a button for each meetings to delete them.
Change default value for recorded attribute
according to django 1.6.