added unshorten parameter to parsed.Parsed and child classes. unshorten=False will skip Parsed.get_unshortened_urls and Parsed.get_url_domains and set .unshortened_urls and .url_domains to empty lists. This is useful in situations where URLs aren't important, such as conditionals.WordConditional. Added unshorten parameter to retrieval.tweet_gen_from_json and retrieval.user_gen_from_json.