Merge master to feature/stabilization
es-ES injection on 20140708-004953
FORUM-606 | Fix problem of NullPointerException when stop server
FORUM-926 | [Answer] update author after editing a comment
FORUM-175 | Remove ForumPollPortlet
FORUM-175 | Remove ForumIconStatePortlet
FORUM-175 | Remove ForumModeratePortlet
FORUM-175 | Remove ForumQuickReplyPortlet
FORUM-175 | Remove ForumRulePortlet
FORUM-175 | Remove ForumStatisticPortlet
Merge feature/stabilization to master
Merge master to featrue/stabilization
FORUM-549 | ForumService.getOnlineUsers() returns empty list in eXo Cloud
PLF-5974: Cannot start PLF with MySQL in UTF-8 (forum)

Fix description:
- Add dialect to repository configuration
FORUM-549 | Resolve UT failures
FORUM-549 | Resolve UT failures - continue
FORUM-541: [Forum] UnsupportedOperationException when deleting or adding attachments

Problem analysis:
* During the update of a topic/post, the attachment cache data are inserted to topic/post object.
  These data are fixed-size Lists and therefore don't allow "add" or "remove" operation.

Fix description:
* Use addAll to get post information as resizable ArrayList.
FORUM-537: [Answer] Incorrect search result of category name

Fix description:
* Update search query on viewing categories.
* Add one more condition to check if user is admin before adding category in the list.
FORUM-798 | [Manage Watches form] Email is not deleted in list
FORUM-867 [Poll] Percentage of each response should be calculated based on participant number

Fix description:
* Both single-choice and multi-choice polls use now the same percentage calculation.
  It takes the number of votes for that option over the total number of voters.