:efactored test specs by marcos and shared examples.
Included the capybara gem.
Added a optional parameter user.
Added a feature test for signing in.
Refactored by solution video.
Added the home page and videos#index path on the header bar.
Added a feature test for my queue.
Refactored by solution.
Merge pull request #6 from HenrykChiu/week_3_code_review_2

Week 3 code review 2