This prepares the way for moving add_handler to XMLStream.
Since stanzas, matchers, and handlers in any XML stream will typically
use unique IDs, XMLStream is a good place for these methods.
Updated XMLStream to return True or False from removeHandler to indicate if the handler
existed and was removed.
Waiter handlers now unregister themselves after timing out.
Now uses the xmlns and stream parameters to reduce the number of
extra xmlns attributes used in the logging output.
Added self.default_ns to XMLStream just to be safe.
The sleekxmpp.xmlstream.tostring and sleekxmpp.xmlstream.tostring26 packages
have been merged to sleekxmpp.xmlstream.tostring. The __init__.py file will
import the appropriate tostring function depending on the Python version.
The setup.py file has been updated with the package changes.
ElementBase is now a direct descendent of object and does not subclass ToString.
Stanza objects now return their XML contents for __repr__.
The previous version passed the same stanza object to each registered handler,
which can cause issues when the stanza object is modified by one handler. The next
handler receives the stanza with the modifications, not the original stanza.
* added stanza unhandled (unhandled iqs now reply with feature-not-implemented)
* added stanza exceptions (stanzas may now reply with exceptions when their handler raises an exception)
* sleekxmpp no longer spawns threads for callback handlers -- there are now two threads: one for handlers and one for reading. callback handlers can get results from the read queue directly with the "wait" handler which is used in .send() for the reply catching argument.
