This PR configures the queuing service for Fedora. To test:

• Delete the existing Fedora image and volume.
• Start up the stack in development mode.
• Once the Fedora container has completed startup, open an interactive terminal in the container: docker exec -it fedora bash -l
• Navigate to the usr/local/test directory.
• Run the test program: ./test-fedora-queue. You should see output indicating that a Fedora object has been successfully created and destroyed, and that the Create message was received from the queue. (This program checks the queue to verify that a test change to the Fedora store is logged in the queue correctly.)

This PR also includes some changes to the production configuration of Fedora -- to use an S3 backend -- but that has already been tested (by updating the configuration on the live testing site).

Finally, one minor non-Fedora fix: adding a HOSTNAME environment variable and its usage in the development.rb to populate config.hosts. This prevents a Rails error when trying to access the development instance non-locally.