Added HTTP chunked encoding support
Refactored chunked encoding support after code review
- Avoid copying buffers when building HTTP chunks
- Simplify configuration by using an Option
- Treat chunked and unchunked messages in a more consistent way
Mainly syntaxic and cosmetic changes in HttpProtocol
Added mandatory HTTP headers in error responses to ensure compatibility with NLB
Merge branch 'master' of github.com:wajam/nrv into clement-nlb
Fix conflicts
Merge pull request #222 from wajam/clement-nlb

Added HTTP chunked encoding support