richardc/beaker — pull request #7 by anodelman (2014-04-23 19:11:08+00:00)
Title: don't allow docker on ruby 1.8

- don't add the gem 'docker' if using < ruby 1.9
- don't 'require docker' until we are sure that we are loading that
class
- raise an error if attempting to use the docker hypervisor with ruby <
1.9