ReceiptsController#new is no longer used
Move PackageMailer to Mailer

Use a single mailer class to handle all email. Multiple mailers will
make more sense if lots of different emails will need to be sent for
varying contexts.
Simplify Receipt#signed_out?
Add 'street' to ldap result template
Grab receipt_ids instead of instantiating receipts
Add worker to update user's address
Add whenever gem
Add PreviousAddress model

Tracks what room or address a resident previously had.
User#update_address! to update and link addresses
Have UpdateAddressWorker use User#update_address!
Update addresses every week
Add whenever capistrano support