- update most of the examples with slixmpp
- change the help channels pointed out in the doc
- add a page listing differences from slixmpp and how to use asyncio
nicely with slixmpp
- fix some in-code rst documentation
This is relying on the stanzas being copied for each handler. We no
longer do that for performance reasons, so instead of editing the copy
in-place, stanza.reply() now returns a new stanza.