Administration page

[elliottsj]

The admin page should have these features:

• Multiple roles: administrator, cashier, (any others?)
• Cashiers can:
  • Edit their own info (email, password)
  • Increase the stock levels of items
  • View all transaction history
• Administrators can:
  • Do everything cashiers can do
  • Manage all other users of trackary (change emails, reset passwords, disable accounts, etc.)
  • Edit the types & prices of items sold