Merge pull request #405 from magento-folks/bugs

Bug
MAGETWO-56699 [GITHUB] Paypal checkout not possible with products that have custom options #5938 - for mainline
MAGETWO-58290 [Github]Empty product option is added on each PUT request #5963
MAGETWO-58136 [Github] Shipping and billing address are not set if order placed with payment action Sale #6438
MAGETWO-55608 [GITHUB] M2.1: Not scrollable picture on mobile / product page #5302
MAGETWO-58285 Ajax error message doesn't display in backend
MAGETWO-58338 [Github]Problem adding attribute options that start with a number via REST Api #5715
MAGETWO-52575 Unable to apply free shipping to specified method when creating order in admin
MAGETWO-57078 [GITHUB] Can't set customer group when creating a new order in the admin. #6162
MAGETWO-58039 Table rate shipping not applying correctly - for mainline