Ruby 1.8.7 Sanity check

Okay. Travis is showing errors on MRI 1.8.7 at the point we wanted to make a `fog-v1.22.1` release...

https://travis-ci.org/fog/fog/builds/26281145

However Bundler is not detecting `celluloid` as a dependency, it passes locally for myself on MRI 1.8.7 and also on JRuby 1.8.7 on Travis.

This branch merges in the tag of the commit released as the `fog-1.22.1` gem to master and lo! it works!