Added video migration and model
Added video_controller.rb and home action as well as route for home. Created home view.
added timestamps to create_videos migration.
Added Category table and model, created one to many relationship for category and videos. Updated home view to reflect updates.
Implemented category show action and view.
Installed rspec. Added testing for Video and Category models as well as relationshtip. Added validations and testing for Video title and description
Added shoulda-matchers gem to test group. Removed unnessary tests and replaced tests with shoulda matchers.
Merge pull request #1 from crq/b1

B1