Nak v1.2.0: incorporated breeze-learn, added LSH
Nak v1.1.3: purged OpenNLP code. +hashing trick, +PCA.
Nak v1.1.2, new API and much simplification.
Nak v1.1.1, w/ liblinear classification.
Nak v1.1.1, w/ k-means clustering.
Nak v1.0