Update http_parser.rb dep to 0.6.0.pre2

em-http-request needs to be updated to 1.1.1 for dependency compatibility

em-websocket-client added to spec suite since em-http-request 1.x does not support websockets

Only functional change outside of this was to manually parse the request_path and query_string as those are no longer exposed by the http_parser C library. This could be reworked a bit to store the URI instance or other if this functionality is still needed.

https://github.com/joyent/http-parser/pull/54

If anything else needs to be done to clean this up to be able to make it in just shout out.

Thanks.