Add support for global install

- Supports global install
- Now use `kappa` instead of `hapi` for all commands
- Support for `file:`, `path:`, and `env:` config protocols (see [shortstop](https://github.com/paypal/shortstop))
- supports `-b` to specify basedir (defaults to `process.cwd()`)
- supports `-c` flag to specify config filename/location (relative to basedir)