- added the HTTP method to the profiler storage
- updated all listeners to implement EventSubscriberInterface
- added TimeDataCollector
- added ContainerAwareTraceableEventDispatcher
- moved TraceableEventDispatcherInterface to the EventDispatcher component
- added RouterListener, LocaleListener, and StreamedResponseListener
- added CacheClearerInterface (and ChainCacheClearer)
- added a kernel.terminate event (via TerminableInterface and PostResponseEvent)
- added a Stopwatch class
- added WarmableInterface
- improved extensibility between bundles
- added profiler storages for Memcache(d), File-based, MongoDB, Redis
- moved Filesystem class to its own component