Changes to haddock

Changes to haddock:
commit 50d1d18cc70cf6c8ffcf247743cd8af0ff9aae16
Author: Mateusz Kowalczyk <fuuzetsu@fuuzetsu.co.uk>
Date:   Thu Feb 13 23:57:16 2014 +0000

    Only warn about missing docs when docs are missing

    This fixes the ‘Missing documentation for…’ message for modules with
    100% coverage.