User Story 9, Book Index Page shows Statistics

[BrianZanti]

As a Visitor,
As a Visitor,
When I visit the book index page,
I see an area showing statistics about all books:
- the three highest-rated books (book title and average rating)
- thre three worst-rated books (book title and average rating)
- three users who have written the most reviews (user name and review count)

DO THESE STORIES FIRST:

• User Story 6, Book Index 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 #26

child of #33

depends on #25