User Story 62, EXTENSION: Admin views a User's Order Show Page

[BrianZanti]

As an admin user
When I visit a user's profile
And I click on a link for order's show page
My URL route is now something like "/admin/users/5/orders/15"
I see all information about the order, including the following information:
- the ID of the order
- the date the order was made
- the date the order was last updated
- the current status of the order
- each item the user ordered, including name, description, thumbnail, quantity, price and subtotal
- the total quantity of items in the whole order
- the grand total of all items for that order

DO THESE STORIES FIRST:

• User Story 56, Admin User Profile Page

Checklist:

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

child of #201

child of #274

depends on #206