Changed DocumentPicker to use <document-list/> directive.
Changed DocumentPickerMultiple to use <document-list/> directive.
Send "column[]" parameter in REST collections URL to give possibility to display columns other than "label" and "modificationDate".
Use <document-list/> directive in BillingArea and Currency lists.
Added "hostName" column in Websites list.
Localization.
Merge pull request #170 from fredericbonjour/Admin

Updated Backoffice.