Merge pull request #211 from fredericbonjour/Admin

Added Rbs_Tag plugin.
FIX OAuth Authorization parameters
[NEW] Preliminary implementation of PermissionsManager
Remove old permissions usage
Fix SQL transaction imbrication
Merge pull request #212 from inthause/documents

[NEW] Preliminary implementation of PermissionsManager
Fix DocumentArray setter property generation
Fix Oauth Authorize request
Merge pull request #213 from inthause/documents

Fix  OAuth authorize and DocumentArray property
[NEW] Add Rest "actions" namespace
Merge pull request #214 from inthause/documents

[NEW] Add Rest "actions" namespace
[NEW] JSON and Object properties now uses decoded values in their getters and setters.
[NEW] Tax edition form.
[FIX] Some fixes in collections.
Merge pull request #215 from intportg/dev

JSON, Tax, Collections...
Fixed cascaded forms.
Added Tag saving into the database: we can now attach Tags to Documents and retrieve them.
Added possibility to set the "style" and "class" attributes on the <preview/> tag in <rbs-document-list/> directive.