Merge pull request #543 from franckstauffer/i18n

I18n
Fix Change commands Listener aggregate
Add \Change\Documents\AbstractModel::isInstanceOf
Add PresentationServices injection on REST Controller
Merge pull request #545 from inthause/documents

Add PresentationServices injection on REST Controller
Fix locales
Add Avatar manager with Gravatar as default implementation
Merge pull request #544 from loiccouturier/master

Add Avatar manager with Gravatar as default implementation
Added `rbs/order/productPriceInfo` REST action.
Added `empty-value-label` attribute on `rbsItemsFromCollection` Directive to set the label for the empty value.
Added picker template for Rbs_Catalog_Product documents.
Enhanced multiple picker layout (with the new action "Select and close"!) and fixed SelectSession feature.
Fix get of commerceServices
Fix construct of url from JS with object as parameter
Use Avatar in frontoffice with twig extension and backoffice with directive and webservice
Merge pull request #546 from fredericbonjour/Admin

Various fixes and enhancements around documents selection
Merge pull request #549 from loiccouturier/master

Use Avatar in Frontoffice and Backoffice
Add \Rbs\Catalog\Std\AttributeEngine::setCollectionManager
Fix \Rbs\Website\Documents\Section::onSelectPathRule
Add new blocks Rbs_Elasticsearch_StoreResult and Rbs_Elasticsearch_Facets