Add library integration

[npaun]

Problem:

• Everything is so convenient now, but the library's full catalog is a disaster.
• You've gotten fined for a late course reserve item, but the reminder notification was late too.
• Although there are no overdue fines, maybe it's best to keep renewing stuff?

Solution:

• Add a module that can parse the library catalog, and send alerts about items coming due, generate an account report, auto-renew items, and maybe integrated with some kind of notification API.

Implementation

• Process the unholy library markup.