Deploy fixes

Various fixes to the code to make it easier to deploy.
49a3bee and fec37ab - Stop old emails from being sent by expiring old ones before enabling the improved cronmail script.
ae40b17 - Converts ZipCode initial_data fixture to migration
c712a2b and b127abc - Improves the logic for installing/updating dependencies, and fixes the problem of installing the correct versions of node and node-less.
cca58fb - Bumps Django to version 1.4.10