Minor changes to twitterizer.py:
	importing auth._AUTH instead of importing just auth
	change to Twitterizer._url_test to check for non-zero length of tweet['entities']['urls'] instead of just its existence.
	deleted some unused variables in a few methods.
Changes to parsed.py:
	tweaked Parsed.__get_meta_keys__ to prepend subdictionary name to subdictionary entry keys (e.g., tweet["user"]["id_str"] is now "user_id_str").
	added parse_user parameter to ParsedTweet.__init__ to allow userdata provided in tweets to not get turned into a ParsedUser instance. Crucially, this avoids a crazy loop arising from ParsedUser.get_timeline (see below).
	added .timeline attribute and .get_timeline method to ParsedUser; a user's most recent tweets are now turned into ParsedTweet instances and stored in a list.