Do a message parsing pass when importing in order to remove urls (which also removes internal file references), and attempt to clean user/channel refs, but remove them entirely if we can't
Do a message parsing pass when importing in order to remove urls (which also removes internal file references), and attempt to clean user/channel refs, but remove them entirely if we can't

cgugino/slack-markov,grantmd/slack-markov,JakeCataford/slack-markov,laswagteam/slack-markov