HubSpot/humanize — pull request #37 by aaylward (2013-06-24 00:56:44+00:00)
Title: add optional downCaseTail arg to capitalize

- calling `capitalize` without the optional `downCaseTail` has the same behavior as `capitalize` pre version 1.4.0
- calling `capitalize` with `downCaseTail=true` will downcase the non-first-characters in the input string
- `capitalize("wHoOA!")==="WHoOA!"`
- `capitalize("wHoOA!", true)==="Whooa!"`