Cut version 0.17.2

This is a small version bump to address confusion around the
`NameFormat` linter, which appears in the documentation but isn't
available in a released gem yet.

Change-Id: Ic0875b4dc34192f36285d773433cc5a342bda12a
Reviewed-on: http://gerrit.causes.com/34125
Tested-by: jenkins <jenkins@causes.com>
Reviewed-by: Shane da Silva <shane@causes.com>