Initial commit
Ignore .rbenv-version
Add dev deps for minitest and mocha

MiniTest is pinned to 3.5.0 because Mocha doesn't currently have a
compat shim for 4.0.x and flips out on startup.
Parse command-line flags
Add a simple model for projects
Add a model for config
Add a parent class for checks
Add a (kinda broken) Puppet wrapper
Add helpers to check active state and run sudo
We need us some Puppet
GH_HOME -> BOXEN_HOME
Add Config#repodir
Use config.repodir effectively
Start stubbing Boxen.run
Add preflights and postflights
Stub CLI and extract Boxen::Util
Boxen.run -> Boxen::CLI.run
Support --help, --env, and --projects
repodir defaults to Dir.pwd
Stub localized puppeteer