Handle promotion usage counter
Add Contains Product promotion rule
Fix some CS issues caused by last merges
Add missing paypal express checkout config.
Fix removing variants from product model

Fixes issue #2162

This is needed for when you remove a variant with
`Product::removeVariant` and then flush the changes.
Merge pull request #2164 from steffenbrem/fix-product-variants-removal

[BugFix] Doctrine mapping for removing variants from product model
Fix user order addressing issue.
Fix "sylius.listener.order_comment_email.class" parameter value.
Merge pull request #2166 from rn0/fix_parameter

Fix "sylius.listener.order_comment_email.class" parameter value.
Remove hardcoded product class from sylius_search
Merge pull request #2168 from antonioperic/patch-1

Remove hardcoded product class from sylius_search
[ContentBundle] Fix for static content not saving (issue 2129)
Merge pull request #2169 from psyray/static-page-fix

[ContentBundle] Fix for static content not saving (issue 2129)
Merge pull request #2165 from Joypricecorp/bugfix/fix-1911-n-more

Fix user order addressing issue.
Merge pull request #2156 from stloyd/bugfix/cs

Fix some CS issues caused by last merges
Merge pull request #2159 from Joypricecorp/fixbug/missing-paypal-config

Add missing paypal express checkout config.
Merge pull request #2155 from winzou/contains_product

Add Contains Product promotion rule
Merge pull request #2154 from winzou/promotion_usage

Handle promotion usage counter
Recursively add taxon children to the taxons array
Merge pull request #2174 from waaghals/taxon-children

Recursively add taxon children to the taxons array