Merge pull request #436 from fredericbonjour/Admin

Reorganization of main navbar to give more space to the Breadcrumb.
Add mrclay/minify composer dependency for backoffice
Remove some PROJECT_HOME constant usage
Add Image Assets ressource in backoffice
Merge pull request #437 from inthause/documents

Remove some PROJECT_HOME constant usage
Add Image Assets ressource in backoffice
Merge pull request #438 from inthause/documents

Add Image Assets ressource in backoffice
Fix DeclinedGroup editor
Merge pull request #439 from inthause/documents

Fix DeclinedGroup editor
Refactor change:set-document-root command
Remove \Assetic\Filter\JSMinFilter in DevelopmentMode (backoffice)
Fix change:set-document-root unit test
Merge pull request #440 from inthause/documents

Refactoring
Refactor WebStore cart assignation
Make \Change\Documents\AbstractDocument::getApplicationServices() public
Add new job 'Change_Document_LocalizedCleanUp'
Code refactoring
Add new 'variant' boolean property on Rbs_Catalog_Product document
Clean up workflow tasks after document deletion
Merge pull request #441 from inthause/documents

Dev + Refactoring