DRY up code by moving DB query to SQLHelper module
Add QuestionFollower class and methods in User and Question classes that use it
Add most_followed_questions to QuestionFollower class and update SQL import statements
Add most_followed method to Question class
Add QuestionLike class
Add one-liners using QuestionLike class methods
Add initialization statement as comment to SQL file
Add QuestionLike::most_liked_questions and Question::most_liked
Add User#average_karma
Add updating/saving functionality
Add Model::find_by_id