Merge pull request #241 from inthause/documents

Update Documents\Query\PredicateBuilder::published() and notPublished() ...
Added "Route not found" view.
REST service now only sends the ID for child Documents.
Fixed help URL.
Cosmetic enhancements.
Fixed JS error in <search-filters/> directive.
Renamed <model-select/> directive to <rbs-document-select/>.
Fixed error management when a property is invalid.
Renamed <model-select/> directive to <rbs-document-select/>.
Added "publicationStatus=DRAFT" on new resources created with REST.newResource().
Added TODO to handle left side bar collapsing in the controller instead of inside the widget.
Added possibility to communicate with a <rbs-document-list/> via an event named "Change:DocumentList:<document list's data-dlid>".
Merge pull request #242 from fredericbonjour/Admin

Additions and enhancements un Backoffice UI.
[NEW] Add document property type 'StorageUri'