Switch to groff rather than nroff for tools, mandoc as an nroff substitute
doesn't support -ms.
Update ruby-tzinfo to 0.3.40.

== Version 0.3.40 (tzdata v2014e) - 10-Jul-2014

* Updated to tzdata version 2014e
  (http://mm.icann.org/pipermail/tz-announce/2014-June/000022.html).
Note update of time/ruby-tzinfo package to 0.3.40.