add reviews model

reviews can be displayed on each movie show page
tested reviews display
tested reviews model validations
[#51495499 state:finished]
implement eric's refactor suggestions
add signup button to root
about to add devise
add user model via devise
link to signup page active
user can create login account

-created user model via devise
-created signup and signout links on root page
-tested user model and signup view
[#51842373 state:finished]
Merge pull request #2 from merhard/movie_reviews

add reviews model
Merge pull request #6 from merhard/movie_reviews

Movie reviews
Finished the user story 'Add a review'

Commented out the validates_presence_of :user_id on the review model and its associated spec
Will reinstate once we have a user model built
[#51496061 state:finished]
Merge pull request #7 from merhard/movie_reviews

Finished the user story 'Add a review'
Merge branch 'master' of github.com:merhard/Movie_App into users
add user_id validation to review model

-added validation to model
-tested validation of model
-successfully able to a review
[#51842541]
implement eric's refactor suggestions

-build the review already associated to the movie
-remove binding.pry
-add user association to review factory
-move Warden helpers to spec_helper file
-refactor user adds_movie_review_spec
Merge pull request #4 from merhard/users

Users