Merge pull request #451 from inthause/documents

Add class for VariantGroup management
[REFACTOR] Rename Rbs_Catalog_Listing to Rbs_Catalog_ProductList ans Rbs_Catalog_ProductCategorization to Rbs_Catalog_ProductListItem.
[FIX] isCompatible()
[NEW] Enable to edit publicationSections property on products.
[ENHANCE] Code formatting and comments.
[FIX] DeleteListener to set 0 instead of null in document properties.
[NEW] Handle SectionProductList documents.
Merge pull request #452 from intportg/dev

Dev
[UPDATE] Add Collection for Promoted Review Modes
[FIX] issue with review detail block
[UPDATE] Add correction on Review and begin Edition work
Merge pull request #453 from renaudJennyRBS/review

Review UPDATE
[UPDATE] Add Gravatar on Review
Merge pull request #454 from renaudJennyRBS/review

[UPDATE] Add Gravatar on Review
[ENHANCE] Product preview colors.
[FIX] URL edition.
[FIX] definitionCollections key in I18nManager
[FIX] Model name in onPopulatePathRule
[NEW] Some enhancements and fixes in URL panel.
[DELETE] metaTitle, description and keyword properties from StaticPage (use DocumentSeo for SEO)