[1.8.x] fix issue #499 (not all the proposed changes are taken)
https://github.com/AsyncHttpClient/async-http-client/pull/499
"NonBlockingFeeder improvements"
Fix test: http://google.com/ now replies with 302
Clean up test + uncover crazy Jetty 8 header normalization
Merge remote-tracking branch 'upstream/1.8.x' into 1.8.x