vkaravir/js-parsons — pull request #4 by vkaravir (2014-05-12 11:42:43+00:00)
Title: Grader refactor

* Added back old variable-value-based grader because needed exercises without function definitions.
* Moved graders to their own objects away from ParsonWidget:
* ```VariableCheckGrader``` executes code and checks variable values after execution
* ```UnitTestGrader``` executes unit tests
* ```LineBasedGrader``` is the original grader based on line order comparison (note: I did not fix the existing bugs with same lines in this grader)