User Story 4, All author names are links to a show page

[BrianZanti]

As a visitor
With the exception of an author's show page,
Anywhere I see an author's name on the site,
I can click on the name to go to that author's show page.

DO THESE STORIES FIRST:

• User Story 14, Author Show Page

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 #31

child of #33

depends on #14

[hsmitha26]

Authors' names are links from Book Index and Book Show pages.