`rake ragel` failed due to renaming the ragel machine from
`http_parser` to `puma_parser` in 3726b7ef19.
The problem was probably overseen since the file
http11_parser.java.rl has not been touched at this commit
and therefore the rake task did not invoke the parser
generation for the java parser.
* Rename Mongrel to Puma and move files appropriately
* Add HttParser11#body method
* Fix native.rake to not attempt C ext under JRuby
* Mask out all of test_unix_socket.rb under JRuby
