User Story 33, Admin can "ship" an order

[memcmahon]

As an admin user
When I log into my dashboard, "/admin/dashboard"
Then I see any "packaged" orders ready to ship.
Next to each order I see a button to "ship" the order.
When I click that button for an order, the status of that order changes to "shipped"
And the user can no longer "cancel" the order.

DO THESE STORIES FIRST:

• User Story 31, All Merchants fulfill items on an order

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 turingschool-projects#274

depends on turingschool-projects#236