* Changed application initialization procedure
  * Application can be started with specific initial configuration data. `Mage_Core_Model_Config::loadBase()` merges this configuration with the highest priority
  * `Mage` class is no longer responsible for application installation status. `Mage_Core_Model_App` has this responsibility (`Mage_Core_Model_App::isInstalled()`)
* Implemented new library component `Magento_Filesystem` for working with file system
  * New component has more abstract layer of interaction with file system, better path isolation
  * Introduced interface Magento_Filesystem_AdapterInterface for file operations. Added concrete implementation in `Magento_Filesystem_Adapter_Local`
  * Introduced interface Magento_Filesystem_StreamInterface for stream operations with content. Added concrete implementation in `Magento_Filesystem_Stream_Local`
  * Added special class `Magento_Filesystem_Stream_Mode` to set parameters of stream on opening (read-only, write-only etc.)
* Added an ability to skip some service functions for lighter launch of application in `app/bootstrap.php`
* Improved batch tool for launching automated tests. Tool has an ability to run specified test types. Tool was moved from `dev/tools/batch_tests` to `dev/tools/tests.php`
* Improved integration test Mage_Adminhtml_DashboardControllerTest to skip test case when Google service is unavailable
* Improved url building process in new jQuery form widget to have it more secure
* Removed obsolete `@group module::<Namespace_Module>` annotation from integration tests, restricted its further usage
* Updated jQuery library used in application, used unified file name instead of version-based one
* Relocated XSD files for System Configuration, Menu Configuration, ACL Configuration, ACL Configuration for WebApi, Theme Configuration, View Configuration, Validator Configuration to `etc` subfolders of corresponding modules
* Bug fixes
  * Fixed bug with placing order in backend using Authorize.Net Direct Post payment method
  * Changed `Mage_Core_Model_Url` to fix bug with incorrect links on frontend (My Wishlist, Go to Shopping Cart, Continue button at first checkout step)
  * Fixed several bugs after converting backend grids to layout declaration. Changes were made in EAV Attributes, Design, Newsletter, Backup modules
  * Fixed incorrect current working directory behavior on application isolation in tests