New version of community (jomsocial) plugin

Merged work by a few iJoomla programmers, under Sinisa Krisan and Matt Jaworski supervision. Biggest new feature - tying Kunena replies and thank yous to Jomsocial notification area and emails.
Please do not change the copyright.  You may include your own copyright under the old copyright notice.
@copyright (C) 2008 - 2014 Kunena Team. All rights reserved.
@copyright (C) 2013 - 2014 iJoomla, Inc. All rights reserved.