Fix credit for Mick O'Brien.
Fixed no_null_computations wrapper to accept arguments. #122
Added Table.z-scores
Fixed test for z-scores
Kill extra whitespace. (house style)
Merge branch 'nonullcomputations-fix' of https://github.com/mickaobrien/journalism into mickaobrien-nonullcomputations-fix
Update CHANGELOG.
Merge remote-tracking branch 'upstream/master'