Add bagit gem.
Sketch out module for creating bags.
Add tree.rb gem for directory walking
Started implementing AmazonBackup class.
Attach amazon backups to cfs directories rather than file groups. This
seems more natural. Since the migration hasn't been pushed anywhere yet
change it instead of adding another.
Sketch out more of the bag creation.
Add bagging stuff.
Complete correct bag generation.
Allow easy bag/manifest deletion.
Remove debugging statement
Don't compute the cfs directory path each time.
Put some of the amazon stuff in config file.
Bit of refactoring.
Make some things class methods that are more logically such.
Set up a way to test amazon backup stuff and add some simple tests
for the generation of the bag.
Brief description of how to use with medusa-glacier server for
uploading to amazon.

What this describes isn't implemented yet, but this is how it
will work.
Add queues for communication to and from glacier server.
Set up delayed job to run with workers handling different queues.
The default queue continues with 3 workers; add glacier queue
with 1.
Increase run time allowed for delayed jobs (anticipating that some
amazon exports will take a long time to bag).
Add archive_ids field to AmazonBackup to represent responses
from Amazon as an array.
Add Job::AmazonBackup class to represent background processing
for creating bags to store and sending amqp messages to medusa-glacier
Add bunny gem to communicate with amqp server.
Added bunny gem.
Add user id to amazon backup to facilitate mailing.
Add mailing.
Refactor and augment description.
Add rake task for picking up amqp responses about amazon uploads.
Add method for checking if amazon backup is complete.
require user for amazon backup