hanshoglund/positive — pull request #1 by meditans (2014-12-20 17:00:47+00:00)
Title: Fixed nats-1 dependency.

The package nats was recently updated to version 1. The difference between this and the preceding version was the
use of the Whole typeclass. I fixed the code removing that derivation, and bumpint nats constraints in the cabal
file.