Underscore names by default.

Stanza objects now accept the use of underscored names.

The CamelCase versions are still available for backwards compatibility,
but are discouraged.

The property stanza.values now maps to the old getStanzaValues and
setStanzaValues, in addition to _set_stanza_values and
_get_stanza_values.

sleekxmpp/xmlstream/__init__.py

@@ -9,6 +9,7 @@
 from sleekxmpp.xmlstream.jid import JID
 from sleekxmpp.xmlstream.scheduler import Scheduler
 from sleekxmpp.xmlstream.stanzabase import StanzaBase, ElementBase, ET
+from sleekxmpp.xmlstream.stanzabase import register_stanza_plugin
 from sleekxmpp.xmlstream.tostring import tostring
 from sleekxmpp.xmlstream.xmlstream import XMLStream, RESPONSE_TIMEOUT
 from sleekxmpp.xmlstream.xmlstream import RestartStream