As far as I could tell, the buffer given to the http parser isn't
modified. Because it is not modified, we can use the
RSTRING_NOT_MODIFIED header to ensure that Rubinius hasn't do the extra
work to copy the data back and forth.
* 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