Added a cleaner to the Jenks clustering algorithm in the file clusterer.js in the StoryLine widget folder. The cleaner merges all neighboring clusters whose average distances between points are within 66.6666% of each other, rounds all scaling factors less than 2 down to 1, and merges all neighboring clusters with a scaling factor of 1. This should help the Jenks clustering algorithm avoid warping the timeline unnecessarily while still fitting the data as best as possible. Also, removed the two old clustering algorithms.