Merge pull request #335 from franckstauffer/stock

UX Improvements and RestfulDocumentInferface added
[UPDATE] Change DocumentResult to ArrayResult in User Permissions and Plugins Webservices
Merge pull request #336 from renaudJennyRBS/documentresult

[UPDATE] Change DocumentResult to ArrayResult in User Permissions and Pl...
[UPDATE] Replace external button action by list action of User Permission and Plugins interface
Merge pull request #337 from renaudJennyRBS/documentresult

[UPDATE] Replace external button action by list action of User Permissio...
Prices are now defined on SKU's rather than products