STUN binding fixed in case of "external address" option



git-svn-id: http://rfc5766-turn-server.googlecode.com/svn/branches/v3.2@1792 d3c6d0af-6456-5cbd-3218-6188ca4e956b
version bump




git-svn-id: http://rfc5766-turn-server.googlecode.com/svn/branches/v3.2@1793 d3c6d0af-6456-5cbd-3218-6188ca4e956b