update comment terminology
change logging to util.log, new cdv path var
updated to allow csv path as argument
updated to match changes in digits.js
updated to match classifier-inn

argument to specify metric, included all the same metrics as
classifier-knn , did not bring over weighted knn or radius based.
Included all metrics but mahalanobis which is not implemented in
classifier.
updated to provide metric object, same as classifier
updated example with regressor/knn changes