Use LinkedHashSet for HttpHeaders.names() and add Javadoc about the performance of names() and entries()
Workaround for a bug in maven-release-plugin where it doesn't work well with Git 1.8.5
[maven-release-plugin] prepare release netty-5.0.0.Alpha1
[maven-release-plugin] prepare for next development iteration
Allow an HTML5 encoder mode for HttpPostRequestEncoder
Write the root multipart boundary before entering mixed mode
Use Content-Disposition: attachment instead of file

As per RFC 6266: http://tools.ietf.org/html/rfc6266#section-4.1
Remove previous form-data header when entering multipart/mixed
Add test cases for HttpPostRequestEncoder