Displays the average rating of the video.
Moves video rating method as well as test spec into video decorator.
Includes the draper gem.
Uses draper for decoration.
Refactor by solution.
Adds a service to handle user sign up logic.
Refactor by solution.
Merge pull request #13 from HenrykChiu/week_7_code_review_2

Week 7 code review 2