2.0.0.0-dev81

* Framework improvements:
  * Covered the following Magento application components with unit tests:
      * `SalesRule/Model/Observer`
      * `SalesRule/Helper/*`
      * `SalesRule/Model/Plugin/*`
      * `SalesRule/Model/System/Config*`
      * `Sales/Model/Config.php`
      * `Sales/Model/Download.php`
      * `Sales/Model/Quote.php`
  * Covered the following Magento lib form elements with unit tests:
      * `lib/Magento/Framework/Flag.php`
      * `lib/Magento/Framework/Escaper`
      * `lib/Magento/Framework/Event`
      * `lib/Magento/Framework/Logger`
      * `lib/Magento/Framework/Util`
      * `lib/Magento/Framework/Registry.php`
      * `lib/Magento/Framework/Backup/Media`
      * `lib/Magento/Framework/Backup/NoMedia`
      * `lib/Magento/Framework/Archive`
      * `lib/Magento/Framework/Translate.php`
  * Created Service API for Magento_Catalog module:
      * AttributeSet service
      * AttributeSetGroup service
      * ProductLinks service
      * ProductType service
* Payments Improvements:
  * Resolved a performance issue with Merchant Country selector under Payment Methods settings
  * Removed the PayPal Payments Pro Payflow Edition payment solution
  * Removed the Saved Credit Card payment method
* Added the following functional tests:
  * Delete Admin User
  * Delete Backend Customer
  * Delete Product UrlRewrite
  * Downloadable Product Creation
  * Update Simple Product
  * Update Tax Rule
  * Update Tax Rate
  * Suggest Searching Result
* Fixed bugs:
  * Fixed an issue where the Create Order page title was not correct when scrolling down was performed
  * Fixed the concurrent test running in MTF
  * Fixed an issue where product custom options were merged incorrectly
  * Fixed an issue where customer group discount was not applied for bundle products
  * Fixed an issue where it was impossible to  create a refund for the PayPal Exprecch Checkout Payflow Edition if captured from the PayPal admin
  * Fixed an issue where adding customer review caused an error in system.log
  * Fixed an issue where  the Manage Stock option was automatically reset to No after changing the Stock Availability option
  * Fixed an issue where the recurring profile attributes where displayed for a product when they were not included in the product attribute set.
  * Fixed an issue where a fatal error appeared in some cases on attempt to add a product to  cart when FPT was enabled
  * Fixed an issue where back in stock product alert emails showed HTML markup
  * Fixed an issue where the Refresh Statistics link on the Sales Report page redirected to the frontend after setting  Add Store Code to Urls to Yes
  * Fixed an issue where the selected bundle options price was included to the price displayed in the MAP popup
  * Fixed an issue where the wrong allowed countries list was used in Checkout
  * Fixed an issue where configurable products with out of stock associated simple products were displayed in layered navigation
  * Fixed an issue where configurable products lost options  after being duplicated using the Save and Duplicate button
  * Fixed issues with simple product custom options where it was impossible to import them from a product page and they were not duplicated correctly using the Save and Duplicate button
  * Fixed an issue where it was impossible to create a customer on the backend in a single store mode
  * Fixed an issue where reviews created on the backend appeared with the Guest status
  * Fixed an issue where it was impossible to add an image for a configurable product variation during editing
* Processed GitHub requests:
  * [#539] (https://github.com/magento/magento2/issues/539) The "{config.xml,*/config.xml}" pattern cannot be processed
  * [#564] (https://github.com/magento/magento2/issues/564) Catalog product images - Do not removing from file system
  * [#256] (https://github.com/magento/magento2/issues/256) Unused file app\code\core\Mage\Backend\view\adminhtml\store\switcher\enhanced.phtml
  * [#561] (https://github.com/magento/magento2/pull/561) Bugfix Magento\Framework\DB\Adapter\Pdo\Mysql::getForeignKeys()
  * [#576] (https://github.com/magento/magento2/pull/576) Change Request for InvokerDefault::_callObserverMethod()