2.0.0.0-dev83

* Created the Service API for the Magento_Catalog Module:
   * Product Attribute Media API
   * Product Group Price API
* Tax calculation updates:
  * Fixed tax calculation rounding issues which appeared when a discount was applied
  * Fixed extra penny issue which appeared when exact tax amount ended with 0.5 cent
  * Fixed tax calculation issues which appeared when a customer tax rate was different from the store tax rate
  * Fixed price inconsistencies between catalog and shopping cart
  * Added support for maintaining consistent prices including tax for customers with different tax rates
  * Added support for applying tax rules with different priorities to be applied to subtotal only
  * Added support for tax rounding at individual tax rate
* Porting Tax Features from Magento 1.x:
  * Price consistency UX and algorithm
  * Canadian provincial sales taxes
  * Fixed issues with bundle product price inconsistency across the system
  * Added warnings if invalid tax configuration is created in the Admin panel
  * Fixed issues with regards to hidden tax
* Fixed bugs:
  * Fixed an issue where grouped price was not applied for grouped products
  * Fixed an issue where a fatal error occurred when opening a grouped product page without assigned products on the frontend
  * Fixed an issue where it was possible to apply an inactive discount coupon
  * Fixed an issue where the linked products information was lost when exporting products
  * Fixed non-informative error messages for "Attribute Group Service"
  * Fixed the invalid default value of the "apply_after_discount" tax setting
  * Fixed an issue where the integration tests coverage whitelist was broken
  * Fixed Admin panel UI issues: grids, headers and footers
* Added the following functional tests:
  * Create Product Url Rewrite
  * Delete Catalog Price Rule
  * Delete Category Url Rewrite
  * Delete CMS Page Rewrite
  * Delete Product Rating
  * Delete Sales Rule
  * Delete Tax Rate
  * Update Catalog Price Rule
  * Update Shopping Cart