Fix for plug.dj API update

The method "addEventListener", PlugDJ's API now use BackBoneJS (i.e. http://blog.plug.dj/api-documentation/ - events section).

More over : 
- "getSelf" method doesn't longer exist. You can get "yourself" by taking the first node of "getAudience".
- "waitListJoin" method doesn't longer exist. Just use jquery.click methods instead.