Basic provisioning working with Chef and Vagrant; much left to do

Here are some scripts and documentation for using Chef (and optionally Vagrant) to install Ontohub. See issue #785.

The system is not yet complete. It installs all the dependencies and runs "bundle install" but does not configure the database or do many of the other things in the deployment guide. Still, I hope it's helpful.
Style/PercentLiteralDelimiters: `%w`-literals should be delimited by `(` and `)`