Refactor - rename StudentQuizController to StudentQuizzesController
Refactor - rename method 'list' to 'index' in all controllers
Method graded? modified for Boolean Zen
Revert "Refactor - rename method 'list' to 'index' in all controllers"

This reverts commit 142240ecf7d7ef95a9e2de7baf5110eacf287fff.
Fixed a bug from a bad merge.

Added the Has quiz option .
 So quizzes could be added to the assignment reviews.
Renamed 'list' method StudentQuizzesController to 'index' as per RESTful guidlines.

Code-cleanup : removed unnecessary instance variables and if-blocks from 'index' method.
Refactored finished_quiz controller method and view to follow Ruby style guidelines.
Eliminated unused instance variables in the method take_quiz
Removed unused code in the method take_quiz
Split the record response method, removed unnecessary code , followed good oo principles.
Changed the grade essays method and the submit_essay grades methods by following good oo principles.
Used the get_mappings_for_reviewer method instead of the where method to get the quiz mappings
Added resource and route helper for the index method of StudentQuizzes class.
Readme file describing instructions for E1460
added a line
Merge remote-tracking branch 'upstream/rails4' into rails4
Merge remote-tracking branch 'E1460/rails4' into rails4