Make test the default rake task
Pin chef version required

This avoids known conflicts with the version of the bunny library we
use. Newer chef gems constrain this and ohai plugins using Chef::Config
will die :(
Extract ohai plugin path to method

Allows for stubbing
Require pry for debugging test failures
New test for integration with ohai plugins

This test will fail if the chef_environment plugin cannot be loaded by
Ohai - the situation that was happening with the non-pinned chef gem
Not required. Provided by the os ohai plugin
Merge pull request #16 from digital-science/chef-dep

Pin chef version to prevent bunny conflicts