Add initial, untested attempt at computing Brier score decompositions.
Add simple unit test for the BrierScore.
Add another BrierScore test.
Make decileBinner the default binner for Brier score calculations.
Fix comment.
Merge pull request #1 from stripe/master

Update master branch.
Merge master.
Merge pull request #28 from echen/brier_decomposition

Add an Error class for computing Brier score decompositions