Merge pull request #169 from intportg/dev

[FIX] Rbs/Admin/i18n.js contents.
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.
MySQL SchemaManager TABLE_CONSTRAINTS query optimization

In order to avoid full databases scan, constraints on the
TABLE_CONSTRAINTS table are moved from JOIN to query predicate.
Merge pull request #171 from franckstauffer/dev

MySQL SchemaManager TABLE_CONSTRAINTS query optimization
Prepared menu to be loaded from the server. Added categories for modules in the menu. Fixed localization. Added menu help.
Fixed menu help localization.
Merge pull request #172 from fredericbonjour/Admin

Main menu is now ready to be loaded from the server.
Add InterfaceSchemaManager::closeConnection()
Add "abstract" attribute on document model

Add Publishable::getTitle()

Add Presentation\Interfaces\Page::getTitle()
Add Presentation\Interfaces\Page::getSection()

Add Presentation\Interfaces\Section::getTitle()
Add Presentation\Interfaces\Section::getSectionPath()
Fix Change to Rbs namespace refactoring
Add section property on website page document
Rename navigationTitle to title property on website page document
Merge pull request #173 from inthause/documents

Update Publishable Interface, Add abstract property on document model
Fix some code for 'abstract' property on document model

Fix Change to Rbs namespace refactoring
Merge pull request #174 from inthause/documents

Fix some code for 'abstract' property on document model