Added the Socksipy module in the thirdparty of SleekXMPP.

Updated the LICENSE file with the license of the Socksipy
module (New-BSD).

sleekxmpp/thirdparty/__init__.py

@@ -8,5 +8,5 @@ try:
 except:
     from sleekxmpp.thirdparty.gnupg import GPG
 
-from sleekxmpp.thirdparty import suelta
+from sleekxmpp.thirdparty import suelta, socks
 from sleekxmpp.thirdparty.mini_dateutil import tzutc, tzoffset, parse_iso