GitLab

* Various improvements:
  * Added static integrity test for compilation of DI definitions
  * Lightweight replacement for PhpUnit data providers is implemented and involved in static and integrity tests with big data providers (primarily file lists)
* Fixed bugs:
  * Fixed broken styles on front-end due to usage of nonexistent stylesheet
  * Fixed plugins configuration inheritance for proxy classes
  * Fixed OAuth consumer credentials expiry not being correctly calculated and added credentials HTTP post to the consumer endpoint
  * Fixed Namespace class references
  * Fixed error on creating shipment with bundle products
  * Fixed uninstallation via console installer
  * Fixed JavaScript error in bootstrap in IE8/9
  * Fixed placing order within PayPal Payments Advanced and Payflow Link
  * Fixed fatal error on placing order with Billing Agreement