[EngCom] Public Pull Requests - 2.2-develop

Accepted Public Pull Requests:
 - magento-engcom/magento2ce#1146: #12231: [GitHub] New Cart Rule : Small styles issue because of styles… (by @serhii-balko)
 - magento-engcom/magento2ce#1245: Misleading feedback when sending tracking information email (by @nmalevanec)
 - magento-engcom/magento2ce#1247: #7213: [GitHub] WEBAPI: PHP session is always started (by @serhii-balko)
 - magento-engcom/magento2ce#1045: 7768: Adding 'is_saleable' attribute to sort of product collection causes exception and adding 'is_salable' has no effect. (by @nmalevanec)
 - magento/magento2#13310: Add the domReady! statement (by @arnoudhgz)


Fixed GitHub Issues:
 - magento/magento2#12231: New Cart Rule : Small styles issue because of styles-old.css (reported by @Triloworld) has been fixed in magento-engcom/magento2ce#1146 by @serhii-balko in 2.2-develop branch
   Related commits:
     1. cdff30d4

 - magento/magento2#5697: [2.1.0] Misleading feedback when sending tracking information email (reported by @peec) has been fixed in magento-engcom/magento2ce#1245 by @nmalevanec in 2.2-develop branch
   Related commits:
     1. f03e6148

 - magento/magento2#7213: WEBAPI: PHP session is always started 2.1.2 (reported by @boldhedgehog) has been fixed in magento-engcom/magento2ce#1247 by @serhii-balko in 2.2-develop branch
   Related commits:
     1. a282973d
     2. 6a586105

 - magento/magento2#7768: Adding 'is_saleable' attribute to sort of product collection causes exception and adding 'is_salable' has no effect (reported by @dnadle) has been fixed in magento-engcom/magento2ce#1045 by @nmalevanec in 2.2-develop branch
   Related commits:
     1. 6267566a