title: Starting a hangout with a list of users invited
body: <p>I have a website where is discussion is happening among some people with valid gmail ids. If one of them in the discussion clicks on the google hangout button, I need to start a hangout with the list of users in the discussion invited already i.e. I need to avoid the <strong>Add Participant</strong> popup that comes up when the hangout app is opened. Is there a way to do this? I explored the documentation and I couldn't find any API to invite a participant.</p>