Continued work on the API
Updated cullWithRespectToTraining to ensure that removing an item from
the list does not affect the rest of the iteration process.
More API work. 6/9 methods are done. None of them have really been
tested yet, but I'll do that once they're all written
Working on getRelevantEvents, need to figure out how I want to go about
comparing EventSets, as .equals only returns true if all of the Events
in the set are the same.