Users can select a tag and see all reviews with that tag

[jmkoni]

Dependent on #23

Describe the solution you'd like
I want a user to be able to see a list of tags on the reviews page and be able to click any and be taken to a list of reviews with that tag. This should also be able to be done from within a review.

[jmkoni]

https://github.com/mbleigh/acts-as-taggable-on ?

[jmkoni]

https://www.reddit.com/r/rails/comments/2chtgw/tagging_in_rails_4/