Advent of Code in Haskell

These are my filthy scratchings in Haskell. The exercises are courtesty of http://adventofcode.com/

"Your filthy code offends me, I'd like to improve it but I don't know how to get started with Haskell"

1. Install Stack (it works on OS X, Linux and Windows)
2. Run stack setup in the root of the repository
3. Run stack test to see the tests run