Made media_oembed_title optional

- Some Imgur albums lack desriptions AND titles...
Force ups/downs to 0, and don't update for changed ups/downs

http://www.reddit.com/r/announcements/comments/28hjga/reddit_changes_individual_updown_vote_counts_no/
Fixed HN scraping URL
Changed schema for thumbnail

MySQL upgrading code:
ALTER TABLE reddit_stories MODIFY COLUMN thumbnail VARCHAR(128) CHARACTER SET utf8;
Update to BeautifulSoup 4
Fix login wrapper
Fix UnicodeEncodeError for titles