Add namespace for modules :
* Models : for module included by models (commentable, attachable,...)
* Managers : for module with a strong logic (PermissionsManager, MenuManager..)
Fix activities sort.
Fix document activities comment missing link.
Fix activity detail render.
Add link to view original image attachment.
Add models namespace to AbstractModelCaption.
Create a namespace Filers for all filters (before/aroud filter) .
Move module to their dedicated folders.
Add filter to remove notification when user directly see the notifiable object.