Kinda sorta plugging into Chef event handling

but discovering in the process that this will probably have to be ripped
out into a gem so that it is usable both in Chef config files and
cookbooks.
This appears to work.  Now to clean up.
Cleanup and hardening

including removing the busted handler-based approach, using ERB in the
Vagrantfile chef json, and using a separate Berksfile for vagrant so
that our real Berksfile stays light.
Removing now-unused spec, adding foodcritic
Cleaning up requires a bit
Holy poo, ancient Chef version on Travis!
Merge pull request #4 from modcloth-cookbooks/attempting-to-tap-into-event-handling

Ensuring attributes load when we want them to load (early)