* include new copyright line, as the file has an additional author now
* split up the `require` lines a bit as we're not alphabetical anymore
* move/rename the HTTP listen port in the command-line parameters
* revert ARGV change since others missed in 26d6c4f; reordering anyway
* add comment to #write so I remember why it was added to begin with

Demonstrates how to integrate Goliath into your EM reactor alongside
Blather.  And also how to send an XMPP stanza in response to a webhook.

We used to catch all iq stanzas and do our own checks to see if they
matched the element name and namespace we were looking for.  Something
like this:

```
	query_node = i.children.find { |v| v.element_name == "query" }
	if query_node.namespace.href ==
		'http://jabber.org/protocol/disco#items'
		...
```

But singpolyma pointed out that this isn't necessary.  So now we use
Blather-native message filtering, and things are much prettier.  And,
more importantly, they are also much more correct.

This diff is fairly small because the largest blocks remain the same
(with the same indentation).  Smaller blocks were moved, de-indented.