#89: Allow proxy borrowing

Most libraries will let you use any library card in your possession without checking identification, but it would also be helpful for many patrons to have someone authorized to access the library on their behalf even without the card. Consider allowing proxy borrowers like the Forbes Library in Northhampton, MA or using hold release forms like many Michigan libraries. This helps, for example, the patron who can come to the library herself when she has someone to drive her but who needs her son to pick up her items when she doesn’t have transportation, or the patron on chemotherapy who likes to come visit the library on just the right day between treatments, but who needs to send his friend to pick out some cheerful movies on his worse days.