+ recycle HttpRequestPacket/HttpResponsePacket in the AsyncHttpClientFilter, when we're sure nobody will try to touch them :)
Port Grizzly FeedableBodyGenerator changes from 1.7 to master.
- Fix redirect test.
- Update Grizzly provider to default back to the WorkerThreadIOStrategy.
- Removed SSL handshake logic from Grizzly's FeedableBodyGenerator.  It's not needed anymore since the handshake is forced when the connection is made.
Upgrade to Grizzly 2.3.6.
Set multiplier to two.
Don't apply outbound encodings.
Initial connection pool changes to support SPDY.
To be fixed up