TODO list:

- config
  - Fix nodejs 0.10.x issue due to a bug in the `rc` package. I've already submited a [PR](https://github.com/dominictarr/config-chain/pull/11)
  - Allow `config.cwd` to be changed by an argument when using the CLI. Two ways of doing this:
    - Read a --cwd or similar and change the `config.cwd` to it
    - Allow any arbitrary `config.*` to be changed with --config.* arguments
- Gracefully remove all created tmp dirs