New version of community (jomsocial) plugin: initial commit

Conflicts:
	components/com_kunena/admin/install/plugins/plg_kunena_community/community.php
	components/com_kunena/admin/install/plugins/plg_kunena_community/community.xml
Remove all white space differences, merge our updates to the code
Fix activity stream to send notification to the topic subscribers only
Merge branch 'master' of github.com:Kunena/Kunena-Forum into master-jomsocial
K 3.0/3.1 - spelling error "Minimum required version is PHP 5.3.1, but it is higly recommended to use PHP 5.4.23 or later." #2574
K 3.0 - correct misspellings on Kunena credits #2571
K 3.0: string length of "last post" subject on index pages #2570
Update activity.php

Do not return every time, otherwise all triggers like onBeforePost will just work on the first plugin and not on the other.
This patch will not fix the compatibility with the existing plugins because some are returning "true" for generic triggers.
It is also possible to get all values and return a merge of these, but the __call function must call every activity plugins.
Update version number to 3.0.7-DEV
Fix broken topic recounting on unpublished topics
When disallow display stats for guests it's remain h2 empty #2557
Merge pull request #2577 from xillibit/k30_bugs4

K 3.0: string length of "last post" subject on index pages #2570
Merge pull request #2575 from 810/master-26-7

K 3.0/3.1 - spelling error "Minimum required version is PHP 5.3.1 #2574
Merge pull request #2603 from xillibit/k30_bugs10

When disallow display stats for guests it's remain h2 empty #2557
Update activity.php

Return the first value we got during the call of the instances.
(in order to keep the compatibility with the previous modification of the function, to use a trigger in order to get the number of points or medals)
Attachments with spaces in file name are overwritten #2576
Increase version number
Properly store like_id in the newer versions of Jomsocial
Properly store like_id in the newer versions of Jomsocial
Trash Manager - Purge items: it missing the Cancel button #2616