initialize Ohai::Loader and Ohai::Runner with Ohai::System
run v6 plugins that depend on v7 plugins in Ohai::System#run_plugins, #require_plugin
remove debug tools
Merge pull request #196 from opscode/OC-9364

Run v6 plugins that require v7 plugins
Merge branch 'master' of https://github.com/opscode/ohai into OC-9409
fix darwin/platform spec