Prepare for deployment
Ban spiders until we're production ready
Remove data-confirm attribute, fixes #4

* Behaviour change: deleting a group no longer causes a confirmation
  alert

We'll need some confirmation method, but deleting groups may become less
important once users are added.
Take a subset of the seed postcode data

Current production database limit is 10k rows; rake db:seed will now
generate 5000 records in production, and 100 records in development.
merging with upstream