Add puppet script for balancer config.
Remove minibus from list of non-husky machines

It has now been welcomed into our happy puppy world
Learn is now a puppy. Don't push to it separately
Code now runs on husky and depends on nas04
Merge branch 'master' of git:infrastructure/dtg-puppet
Merge branch 'master' of balancer.dtg.cl.cam.ac.uk:/etc/puppet-bare
Nagios monitor weather.dtg. In the future munin monitor it too