Remove `milli` math unit.
Remove `milli` math unit.

Removed the `milli` math unit which is a synonym for `millisecond`.

We don't do synonyms.

    File                             Raw         Min         Zip     Min/Zip
    timezone.js              14568/14.23  7452/07.28  3986/03.89  2871/02.80

Closes #66.

bigeasy/timezone,bigeasy/timezone,bigeasy/timezone