create about.html.erb page with content
migration for active column in db for question_set
Removed extra 'add class' div and fixed the remaining 'add class' button and form styling.  Also removed comments from 'about' method in welcome controller.
made question set active and fixed one mistake on a question
Merge branch 'class-groups-edit' of github.com:makersquare/clicker
Implemented Fabricator gem for Before mocking; passed first test for question count
Modified question fabricator to assign type as ShortAnswerQuestion, not MultiChoiceQuestion
Refactored before block for mocking; Now passing all 8 example tests to check various Question types
Tests for all types of questions' presense, choices, and answer (within choices) passing
Added revised tests for MultiChoiceQuestion including new custom validation in MultiChoiceQuestion model