Remove stun in gtel wizard

git-svn-id: http://csipsimple.googlecode.com/svn/trunk/CSipSimple@2359 9f815046-5998-e9c0-b7e2-ac03a23edfa4
Fixes issue 2630.
Support python 3 in toolchain.

git-svn-id: http://csipsimple.googlecode.com/svn/trunk/CSipSimple@2360 9f815046-5998-e9c0-b7e2-ac03a23edfa4
Upgrade pjsip to r4724

git-svn-id: http://csipsimple.googlecode.com/svn/trunk/CSipSimple@2361 9f815046-5998-e9c0-b7e2-ac03a23edfa4