Simple stats toolkit for Clojure/Script.

Objectives:
  - All Clojure/Script implementations.
  - Pleasant+consistant API w/ beginner-friendly documentation.
  - Start with basic, commonly used utils. Can expand over time.
  - Start with short, understandable algorithms. Can optimise over time.

Refererences:
  [R1] A Computer Method for Calculating Kendall's Tau with Ungrouped Data
       by William R. Knight, Journal of the American Statistical Association
       Vol. 61, No. 314, Part 1 (Jun., 1966), pp. 436-439 (4 pages).

  [R2] Efficiently Computing Kendall's Tau by Matt Adereth,
       http://adereth.github.io/blog/2013/10/30/efficiently-computing-kendalls-tau/

Private implementation details.