Remove unused EventsController
The EventsController was no longer used since 354b9e4. @look said it was
cool to blow it away. See
https://github.com/minnestar/sessionizer/commit/2af2c156e741e3da6e0e243ca872991086af1b58#commitcomment-7644762
Merge pull request #47 from jcoyne/remove_events_controller

Remove unused EventsController