Tools to extract all URLs from a Twitter user's public stream.

Naturally, the URLs we get are off of Twitter's t.co URL shortener, but
that's fine -- with appropriate extensions to ArchiveBot, we can archive
both the shortener link and the real link.  (Or we can resolve it
ourselves and pass that to ArchiveBot.)
Ignore twitter/*.json, sans sample config.

This helps protect us from committing real configs into source control.