Update to typesafe-config 1.2.1 from 1.0.1 so a "d" is a day and other goodness.

The driver for this is the old version interpreting "7d" as "7 milliseconds as a double" or some
such silliness, but it brings other side benfits along as well.
Merge pull request #3 from socrata/marcs/update-typesafeconfig

Sounds good, merging.