Removed the weirdo logging facility. There's now a Debug variable which can be set which replaces the former debug log. NewClient() will return an error if something goes wrong setting up the connection.

Added a Close() function and fixed a couple of shutdown bugs.

gofmt

to-do update.

Listen for XMPP connection status changes, and print them out.

Renamed Extension.StanzaHandlers to StanzaTypes, and updated the doc comment.

Don't keep the password around after we've used it.