Make specs Ruby 1.8 compatible

We accidentally regressed here with the addition of some specs. We want
to support Ruby 1.8 for OS X compatibility, since it comes with 1.8.7
out of the box. Requiring rbenv/rvm is not fun for users.

Change-Id: I0bcea43ba5ef73f4ca41e0a1e3bf61d4f1ebccd3
Reviewed-on: https://gerrit.causes.com/23502
Tested-by: jenkins <jenkins@causes.com>
Reviewed-by: Joe Lencioni <joe.lencioni@causes.com>