* fixed many stanza bugs

* 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/xmlstream/handler/waiter.py

@@ -20,7 +20,7 @@ class Waiter(base.BaseHandler):
 			return self._payload.get(True, timeout)
 		except queue.Empty:
 			logging.warning("Timed out waiting for %s" % self.name)
-			return StanzaBase(stype='error')
+			return False
 	
 	def checkDelete(self):
 		return True