remove cruft from hxstomp URL which was causing a 404

On the "implementations" page, clicking on the link for hxstomp resulted in visiting the page http://stomp.github.com/hxstomp%7Chttp://code.google.com/p/hxstomp/ which of course does not exist.

So, I removed the extraneous "hxstomp|" at the beginning of the URL.