This is behind a use_dnspython flag, however, so it can be disabled as
desired.

Fixes log.debug message in _connect_proxy

Fix support for jabberd2 with GSSAPI

Despite http://xmpp.org/rfcs/rfc3920.html#rfc.section.6.2, jabberd version 2.2.14 cannot accept the typical "<response xmlns="urn:ietf:params:xml:ns:xmpp-sasl">=</response>".  Instead it must be truly empty, so we force an empty response for this stanza only.

When the GSSAPI mechanism's process() function is invoked for the third time (on success) it must not attempt further processing.  Instead it should clean the context and return an empty response.

Replaced the reference to kerberos.GSSError.message in any raised exception, because:

 DeprecationWarning: BaseException.message has been deprecated as of Python 2.6

and its natural repr is probably the most desirable output.

Fix Don't process vCard avatars for MUC occupants caused TypeError

doc typo fixed

See issue #278

fixed setRole function, 

fixed setRole function, the check where made against 'affiliation' values, now we do that against actual role values

close #276, now we  trigger 'groupchat_message_error'  

Fix X-FACEBOOK-PLATFORM authentication in Python3.

Closes issue #278

close #276, now we  trigger 'groupchat_message_error'  and  muc::ROOM::message_error when we receive a message type=error from the server

XEP-0065 Implementation Broken

SCOKS5 SID were removed multiple times from the _sessions dictionary