AddC
====
Finds clusters in data using the AddC online clustering algorithm with gaussian kernel
The original Python code & explanation is here:
  https://gromgull.net/blog/2009/08/online-clustering-in-python/
Original AddC paper:
  https://www.cs.huji.ac.il/%7Ewerman/Papers/guedalia_etal99.pdf
Kernel-based extension:
  https://parnec.nuaa.edu.cn/zhangdq/nepl04.pdf
It was originally released under the WTFPL license. This code is too:
  You may have this code under the 
  Do What The Fuck You Want To Public License 
  https://sam.zoy.org/wtfpl/
Example Usage:
	var OnlineCluster = require('addc').OnlineCluster;
	var c = new OnlineCluster(10); // max number of clusters
	for (var i = 0; i < 100; i++) {
		// can be any number of dimensions; they'll be zero-padded if they don't match
		c.cluster([Math.random(), Math.random(), Math.random()]);
	}
	var clusters = c.trimmedClusters();
	// var allClusters = c.clusters;
	console.log(clusters[0].center);