Merge branch 'develop' into Fearless-Kiwis-MAGETWO-60765

* develop: (22 commits)
  MTA-3891: Add variation for Close a Sales Order Paid with PayPal Payments Pro
  MTA-3885: Add variation for Place order via Payflow Pro with AVS Street verification fail
  MTA-3184: Null xsi:type in variations causes an exception
  MTA-3864: Create auto test to check Cancel checkout
  MTA-3953: Implement instrument which allow Functional Tests to download file from Magento Export functionality
  MTA-3891: Add variation for Close a Sales Order Paid with PayPal Payments Pro
  MTA-3953: Implement instrument which allow Functional Tests to download file from Magento Export functionality
  MTA-3953: Implement instrument which allow Functional Tests to download file from Magento Export functionality
  MTA-3894: Create auto test to Create Refund for Order Paid with PayPal Payments Pro
  MTA-3891: Add variation for Close a Sales Order Paid with PayPal Payments Pro
  MTA-3889: Add variation for Guest Checkout using PayPal Payments Pro and Flat Rate
  MTA-3885: Add variation for Place order via Payflow Pro with AVS Street verification fail
  MTA-3883: Add variation for Checkout via Braintree Paypal with several products
  MTA-3883: Add variation for Checkout via Braintree Paypal with several products
  MTA-3864: Create auto test to check Cancel checkout
  MTA-3864: Create auto test to check Cancel checkout
  MAGETWO-61368: [Github]Minicart not updating after sign in #7500
  MAGETWO-61261: Cover with Js unit test changes introduced in the scope of bugfixing
  MAGETWO-61092: Error css in customer account with Toolbar-amount and mobile design #7437
  MAGETWO-61368: [Github]Minicart not updating after sign in #7500
  ...