2.0.0.0-dev72

* Framework Improvements:
  * Fixed performance degradation caused by DI argument processors
* Modularity improvements:
  * Introduced the Magento_UrlRewrite module, and moved corresponding classes from Magento_Core to Magento_UrlRewrite
  * Moved all Install logic to the Magento_Install module
  * Eliminated the Core\Helper\Js class
  * Moved the Email related logic from the Magento_Core module to the Magento_Email module
  * Moved the Cache related logic from the Magento_Core module to library
* Indexer improvements:
  * Added execution time hints for console reindex
* Customer Service usage:
  * Refactored the Magento_Newsletter module to use Customer service layer
* Fixed bugs:
  * Fixed an issue with resetting customer password from the frontend
  * Fixed an issue where mistakenly the attribute of the Customer Address Edit form was cached
  * Fixed an issue where admin could not unsubscribe customer on the customer edit page in the backend
  * Fixed an issue where customers were always subscribed to the newsletter even if not selected during registration
* GitHub requests:
  * [#325] (https://github.com/magento/magento2/pull/325) -- ImportExport: Fix notice if _attribute_set column is missing