TopicBot
 - !settopic - sets the current topic
 - !topic - prints the current topic
 - Saves all topics set from !settopic to a text file along with a timestamp
   and who set the topic
 - On load, sets the last topic in the topics file as the current topic
 - Current topic will time out after X hours (or just display the time)

   Play with http://www.chartjs.org/docs/