plugins/twitter: unescape html entities
somethingawful: use api_key hook instead of bot.config
stock.py: change to use yahoo API
Calculate change percentage correctly

Measuring percent change based on the current price instead of the
original price is silly; instead use change / old price
Merge pull request #90 from jstultz/fixstock

Calculate change percentage correctly
tvdb: don't download zip files, just use the xml endpoint
tag: allow boolean intersection searches