jids aren't escaped properly

[GoogleCodeExporter]

What steps will reproduce the problem?
1. set a jabber client with a resource containing a '
2. add this user to your roster
3. try to log on ijab

ijab will not escape the resource and the xmpp server will refuse the packet as 
it won't be a proper xml packet.

Original issue reported on code.google.com by [email protected] on 10 Sep 2010 at 4:11