Add mail notification for all the contributors of the thread
Change Jahia dependency version to 6.6.1.0

Conflicts:
	pom.xml
- Transformed notifications into a rule system that makes it possible to more flexibly setup notifications
- Integrate with jahia-spam-filter module so that we don't send notifications when a post has been flagged as spam
- Fixed resource bundle entries
- Fixed some encoding issues in the body of the message, still a known issue with the subject header

Found also a issue with Camel while working on these changes: https://jira.jahia.org/browse/QA-4017
Little X-mas gift for the forum users :
- Now notifications subject will be different when content is detected as spam
- Fixed error when no content was submitted.
- Fixed issue with locale and date
german translations
german translations
Order messages by creation date descending