polish up attributes section confusing tips.
pass $children variable (variations) to the woocommerce_variable_product_sync hook
Changed label of orderby setting in product category widget.
Merge pull request #4031 from helgatheviking/sync/add-child-to-action

pass $children variable (variations) to the woocommerce_variable_product...
Merge pull request #4038 from emzo/widget-product-categories-orderby

Changed label of orderby setting in product category widget.
Merge pull request #4030 from bernardpeh/woocommerce-dev

polish up attributes section confusing tips.
Take out default variations #3169
Only load integration abstract when needed #3169