Add README for hiera data
Classify all our existing agent'd nodes

The node == role mapping isn't /great/ but because we have nodes that server a
number of functions, we can't really say 1 logical role (e.g. 'webserver') can
map to 1 logical node
Update to the latest puppet-irc which is more accomodating for Puppet Enterprise
Add doc about how to install agents
Merge pull request #11 from jenkins-infra/documentation

Add README for hiera data
Merge pull request #15 from rtyler/classify-existing-nodes

Classify all our existing agent'd nodes
Merge pull request #16 from rtyler/pe-and-irc

Update to the latest puppet-irc which is more accomodating for PE
Merge pull request #17 from jenkins-infra/staging

Bring classification/irc to prod