Add BOSH support for XMPP accounts
Submitted by Wade Berrier
Link to original bug (#760687)
Description
BOSH helps tunnel xmpp over http/https (http://xmpp.org/extensions/xep-0206.html)
Configuration wise, a bosh url is the only user input necessary.
I'm not sure if empathy is using libpurple for xmpp, but I'm assuming that libpurple supports BOSH.
Version: 3.12.x