Changed how to pass twitterizer classes tests--now it's a list, instead of *args, so you don't need to specify all the defaults before you add custom ones.
Changed twitterizer.Twitterizer.filter_tweets to .filter_tweet: now it handles 1 tweet at a time, and returns either (text,metadata) if the tweet passes the tests,
or None if it doesn't.
Fixed the regex pattern in parsed_tweet.ParsedTweet.get_unshortened_urls to match https urls.