use different plugin path

[logicminds]

I am trying to fix another gem's problem that uses plugins and wanted to know if the pluginator could use a different path besides lib/plugins/.

I would like the lookup path to be 'lib/kitchen' or 'lib/inspec' and since these tools are well established there is no way to change the plugin directory to lib/plugins

[logicminds]

This seems to hard code the path: https://github.com/rvm/pluginator/blob/master/lib/pluginator/autodetect/finder.rb#L47

https://github.com/rvm/pluginator/blob/master/lib/pluginator/autodetect/finder.rb#L84

[mpapis]

closing in favor of #15