Reviewer: sergey

- tested manually with sbcl

- Replace cl-stomp's string-to-bytes and string-from-bytes with
  babel equivalents for utf-8 support.

- Removed the unused force option to qres-stomp-client:stop to
  avoid issues with using kill-process.

- Rearranged code in handle-stomp-request so that the stomp
  transaction is started and an ack is sent as soon as the request
  is received.  Previously, the ack wasn't sent until after the
  request had been processed.

 - Make the API functions more robust against bad inputs
 - Fix some inefficiencies
 - Generally make it use better Lisp style
 - Get the example code working

Testing: The STOMP tests that Matt already wrote still work correctly.

With authorization of the original author and of ITA,
this code is made available under an MIT-style license.

git-svn-id: https://cl-stomp.googlecode.com/svn/trunk@2 d1d7026a-752b-0410-a81f-eb38e5697356