Per project settings

* Ability to define documents base path per project.
* Per project cmis sync
(added a french translation also)
* Option to fall back to default settings
* Option to not use doc categories
* Added the versionLabel information to attachments
* Ability to update an attachment (requires active_cmis >= 0.3.3, doesn't work with Nuxeo, tested with Alfresco4)
* Redmine 2.3 compatibility