This major version updates the extension for Behat 3.0

Changes:

• Updated the extension for Behat 3.0
• Renamed the KernelAwareInterface to KernelAwareContext
• Renamed the extension to Behat\Symfony2Extension\ServiceContainer\Symfony2Extension, allowing to use Behat\ Symfony2Extension as shortcut to register it
• Added ability to test multiple bundles at the same time using suites
• Added ability to inject application services into contexts