Merge pull request #872 from loiccouturier/master

Enhance product editor for variant
Handle unlimited inventories in variant stock editor + add links to edit the product and the SKU
Fix visuals in product aside preview.
Enhance variant editor (left menu and disable some screens during variant generation)
Fix comments and code formatting.
Fix grid parameter in page templates
Enhance CrossSellingProductList and ProductListItem routes
Update routes for Rbs_Theme_Template.
Update routes for Rbs_Theme_Template.
Fix cart line key equality test.
Add 'FRC' geo Zone in setup
Deactivate template page cache in development mode.
Add coupons implementation in Cart and Order
Fix \Rbs\Generic\Json\Export class
Merge pull request #873 from intportg/dev

Misc BO enhancements (variants, product lists)
Merge pull request #875 from inthause/documents

Add coupons implementation in Cart and Order
Enhance attribute editor
Enhance webstore selector. Fix some stuff on product FO