Merge pull request #496 from intportg/dev

Dev
Merge pull request #497 from intportg/dev

[FIX] Fatal error.
[Add]CrossSelling initial commit
[Add]Cross Selling : symmetrical lists
[Fix]Last merge conflicts resolution
Merge pull request #498 from rbs-maugier/master

[Add] Cross Selling
[UPDATE] Substitution variables for SEO metas
[UPDATE] Seo Substitutions works with functional page
[FIX] Metas of document SEO on document doesn't work
[UPDATE] getMetaVariable no longer has to create a new document
[UPDATE] remove some debug codes
Merge pull request #501 from renaudJennyRBS/seo

Seo Substitution variables for metas
[UPDATE] Add Seo test for meta substitution variables
[Fix]Cross-selling fixes
Merge pull request #504 from renaudJennyRBS/seo

[UPDATE] Add Seo test for meta substitution variables
Update Elasticsearch commands
Add new Rbs/Elasticsearch/Std/FacetDefinitionInterface
Add new \Change\Services\CommonServices class
Website property on Rbs_Elasticsearch_FullText is now required
Fix i18n key in Rbs_Elasticsearch module