Changes to get image and database backups working

script/update_backup is a minor rewrite of a script I've been using for
years to maintain a backup of the images and database for MO.  It
includes SQL code for striping email addresses out of the database and
will copy over any images on the MO image server (currently at
DreamHost) that are not on the local system.  It does depend on
appropriate ssh keys to exist on both the MO database server and the MO
image server.

I also updated the LICENSE file to 2013.
Moved database.yml to config-script

Since different platforms need different database.yml, I decided it
made the more sense for the version for the VirtualBox Ubuntu build to
be in config-script.