Author Show Page

[turing-cardcannon]

As a Visitor,
When I visit an author's show page
I see all book titles by that author
Each book should show its year of publication
Each book should show its number of pages
Each book should show a list of any other authors
(exclude this show page's author from that list)

Checklist:

• base code tests are written
• base code is written to pass tests
• edge case ("sad path") tests written
• edge case code written
• code is reviewed
• branch is merged
• all tests still pass

child of #18

depends on #20