2.0.0.0-dev37

* Refactored a variety of grids in backend (admin) to make them configurable through layout, rather than hard-coded. The following classes were affected (converted): `Mage_User_Block_User_Grid`, `Mage_User_Block_Role_Grid`, `Mage_Adminhtml_Block_System_Design_Grid`, `Mage_Adminhtml_Block_Catalog_Product_Attribute_Set_Grid`, `Mage_Adminhtml_Block_Newsletter_Problem_Grid`, `Mage_Adminhtml_Block_Backup_Grid`, `Mage_Adminhtml_Block_Tax_Rate_Grid`, `Mage_Adminhtml_Block_System_Store_Grid`, `Mage_Adminhtml_Block_System_Email_Template_Grid`, `Mage_Adminhtml_Block_Sitemap_Grid`, `Mage_Adminhtml_Block_Catalog_Search_Grid`, `Mage_Adminhtml_Block_Urlrewrite_Grid`, `Mage_Adminhtml_Block_System_Variable_Grid`, `Mage_Adminhtml_Block_Report_Review_Customer_Grid`, `Mage_Adminhtml_Block_Report_Review_Product_Grid`
* Modified behavior of configuration merging. Each config file can be separately validated against DOM schema.
* Moved `Mage_Adminhtml_Utility_Controller` to `Backend` and changed all child classes
* Changes in Profiler system:
  * Created separate component for handling Profiler Driver selection logic
  * Extended `Magento_Profiler::start()` calls with tags as second argument
* Bug fix - Added additional validation into `Mage_Adminhtml_Catalog_CategoryController` to prevent saving new category with any id using firebug