Merge pull request #331 from galthaus/develop

Fix docs from master commits.
Disk size was incorrect
Update README.md
Force chef-client to a version that works
Only create a network file if one is missing.
Move ruby to 2.1.2 - like we run with.
Merge pull request #337 from galthaus/hardcode-chef

Force chef-client to a version that works
Merge pull request #338 from opencrowbar/develop

Merge develop into master to recut Broom.final with working chef.