Rethink the whole cron/update-everything malarky

[gravitystorm]

Time have changed since 2011!

We should normalize the way these chef cookbooks work to match current best practices, so that anyone wanting to contribute has as few surprises as possible. The update-everything.sh bash file is the antithesis of expected behaviour.

We should distribute cookbooks to the machines running cyclescape using a chef server, and we should run the standard chef-client on each machine to handle the chef runs. This will also make it easier to integrate with chef testing tools without having to bodge them into our current peculiar setup, and allow people install cyclescape using a standard chef setup.