Patch from Jehiah Czebotar to catch an additional server disconnect
situation.
Patch from Andrey Petrov to add the "append" and "replace" commands.
   *  Patch from Jehiah Czebotar which does: Changing the calls to
      mark_dead() to make them dereference tuples, reducing timeout on
      sockets to 3 seconds, settable via setting Host._SOCKET_TIMEOUT.
   *  Patches from Steve Schwarz for set_multi() to return the full set of
      keys if all servers are down.  Previously would not report any keys.

   *  Fix from Steve Schwarz delete_multi() argument "seconds" not being
      correctly handled.  Changed it to "time" to match all other calls.
   *  Patch from Peter Wilkinson to support using unix domain sockets.
      He reports that tests succeed with with memcached daemons running,
      the normal and a domain socket started via
      "memcached -s memcached.socket".  I massaged it quite a bit.

      To use domain sockets, use a connect string of "unix:/path/to/socket"
      Note however that if you are using a host name of "unix", it will now
      detect "unix:11211" as being a domain socket with the name "11211".
      In this case, please use "inet:unix:11211".

      Because of this, it is now preferred to use a connect string prefix
      of "inet:" or "unix:".
   *  eliott reported a bug in the 1.42 related to the socket timeout code
      causing a traceback due to the timeout value not being set.
Allowing spaces in the key.
Detecting when the pickler needs a positional argument.
Moving length check after the compression.
Fixing arguments passed to the _Error if invalid read length.
Fixing the representation of domain sockets.
Changing a typo of dead_until.
Providing better error messages (patch provided by Johan Euphrosine).
Updating the changelog.
   * Adding get_slabs() function to get stats.  (Patch provided
     by Nick Verbeck)
For 1.44 release.
Fixing set example in docstring.
   * incr/decr were raising ValueError if the key did not exist, the
     docstring said it returned none.  Patch by Chihiro Sakatoku.

   * Included cmemcache_hash, by permission of Ludvig Ericson.
     To use, do "memcached.cmemcache_activate()".

   * Adding cas method, submitted by Ben Gutierrez.
   * Fixing exception raising syntax.  Patch by Samuel Stauffer.

   * Optimizations in read code.  Patch by Samuel Stauffer.

   * Changing classes to be newstyle.  Patch by Samuel Stauffer.

   * Changed "has_key" to "in".  Patch by Samuel Stauffer.
* Rejecting keys that have spaces in them.  Patch by Etienne Posthumus.