Added lastUpdated property to listings
Now in reverse order with AM not in capitals
Listings/services now store the email and date of the last person to update/complete a service
Style display of audit information

- Gives it the grey 'hint' colour when presented on the summary page
- Removes it from the home page altogether (looked too cluttered)
- Minor typesetting tweaks
Merge pull request #101 from alphagov/audit_information

Display audit information for a service