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 PreviousAddress model

Tracks what room or address a resident previously had.
User#update_address! to update and link addresses
Add worker to update user's address
Add whenever gem
Update addresses every week
Add whenever capistrano tasks
Fix whenever_command
Only update addresses for residents
Check for LDAP_SERVER inside DirectorySearch
Always stub ldap server when stubbing ldap results
Don't filter attributes returned by ldapsearch