fix: function call to taskqueue.add now has correct parameters; _speakerAnnouncement() uses sessions.count instead of sessions.length.
fix: function call to taskqueue.add now has correct parameters; _speakerAnnouncement() uses sessions.count instead of sessions.length.

anudhagat/ConferenceCentral,anudhagat/ConferenceCentral,anudhagat/ConferenceCentral