changed regex in elnode--http-parse-status to support arbitrary methods

I'm not sure how servers are supposed to handle non-standard methods. I'd think passing them to the application would be better, at least from the forward-compatibility point of view. An alternative would be to extend the regex to handle all standard methods.

Btw, I had an issue with elnode, where emacs would send a blank response, and not use the handler. Maybe once every 70 requests. I'm not even sure whether it gets to the filter stage. Is this a known problem?