[FIX] Set an empty array as default value for availableWebStoreIds parameter in WebStoreSelector block.
Update cart in the frontoffice order process
 - new action UpdateCart
 - new objects for coupons and shipping modes in cart (Rbs\Commerce\Process\BaseCoupon and Rbs\Commerce\Process\BaseShippingMode)
[FIX] Head menu dropdowns should be over the website navbar.
Merge pull request #786 from loiccouturier/master

Add corrections on some documents. Enhance some directives
Merge pull request #787 from intportg/dev

Update cart during the frontoffice order process + fixes
- Fixed list of changes in editors in case of same sub-documents.
- Load default values from the server for new documents.
Prevent tags from being loaded for new documents (with ID<0).
Added `<rbs-document-chained-select/>` directive to allow selection of a document with multiple and chained select inputs.
Fixed styles for fields that have errors after saving a Document in an Editor.
Merge pull request #789 from fredericbonjour/Admin

Editors: added default values for new documents and fixed style for erroneous fields. Added <rbs-document-chained-select/> directive.
Rename PageTemplate to Template
Merge pull request #790 from renaudJennyRBS/template

Rename PageTemplate to Template
Activate correction on rbs_shipping_mode
Activate correction on rbs_payment_connector and rbs_payment_deferredconnector
Activate correction on rbs_media_image
Fix document list when use it in document editor
Activate correction on functional page
Activate correction on rbs_simpleform_form and rbs_simpleform_field
Activate correction on rbs_seo_modelconfiguration and rbs_seo_documentseo
Activate correction on rbs_elasticsearch_facet and rbs_elasticsearch_facetgroup