Make the anchor type propagate refresh events

Without this patch the anchor resource does not propogate refresh
events, making it difficult to subscribe to a class which has been
notified by another resource.
Add behavior example for anchor refresh propagation

Without this patch we don't have a spec test to make sure the anchor
resource type passes notify events along.  This patch addresses the
problem by using RSpec Puppet to build a catalog, apply the catalog,
then pull a resource out of the transaction and make sure the resource
was triggered.
Merge branch 'philandstuff-master'

* philandstuff-master:
  Add behavior example for anchor refresh propagation
  Make the anchor type propagate refresh events

closes #78