Fixed issue involving topics-within-topics.
Made quiz styling prettier.
Added functionality for hiding particular items from topics. Simply add URL parameters 'novideo=true', 'noreading=true', etc. These must correspond to the 'classes' outlined in bjc-topic.js.
Merge pull request #37 from peterasujan/gh-pages

Fixed issue involving topics-within-topics, made quiz styling prettier, added ability to hide stuff from topics.