add a placeholder .mailmap
eliminate a prereq by testing distmeta directly
better diagnostic output on failure
use a more reliable mechanism of ensuring that our metadata in tests is spec-compliant
shorten by a few lines
shorter pod lists
do not rely on Moose to provide confess
just warn about invalid options, rather than dying
Dist-Zilla-Plugin-OptionalFeature-0.015

          - now allowing unrecognized options, with a warning, rather than
            dying (allows proactively releasing distributions using
            not-yet-implemented options)