need isolated background for grader_spec
Switched Feature and Scenario block, passes test but still exits invalid cucumber results. Interestingly shows blank for features after Running features locally:
Regex match vs single step or steps
moved cli into hw3_grader.rb where it should be a module, reticent to disperse any more.
disperse cli() to subclasses of Autograder.  Unfortunately Heroku and Github graders inherit from WeightedRspec but prefer grandparent's cli() implementation. If command_line caller knows the type, can they not call them directly rather than via Grader.cli() ?