Merge pull request #3 from SunnyIzr/scoring-and-creations-for-quizzes

Scoring and creations for quizzes
adding devise gem
adding flash messages in layout view
setting up configurations for devise
devising user model and migrating all devise columns for database
removing second email column from users
adding user password field in user factory
updating seed_user rake task to include password
adding a show user action and view
ensure authentication before every action
create a dashboard view for current user
creating a login/logout button
removing home_page and show_users view
Merge pull request #4 from SunnyIzr/adding-devise

Adding devise
create an method to return answer choice for a question
adding a test for quiz complete action
testing quiz score actions
adding coverage folder to gitignore
adding coverage gem
moving unncessary random question logic from question model to quiz model