Lock down users in admin console

* Closes #122
add subtotal and total with refactored formatting to orders
move logic from view to model for display formatting
add link to items from orders
Merge pull request #125 from AdamSmith910/master

user show
Merge pull request #126 from dglunz/cleanup-orders

Cleanup orders
Merge pull request #124 from bayendor/122_remove_users_from_admin

Lock down users in admin console