Minor changes to main, added BDD tests

[ScottONeal]

Thanks for this cool package!

In effort to try continue development on this module, I added basic BDD tests. To properly handle errors in the tests, I had to add basic error handling middleware to the lib/index.js.

To run tests:

npm install
npm test

Additionally, added a spawn event which passes the child_process instance. This could be useful to hooking into and logging command output or getting the exit code.

Also, I can add a .travis.yml if you would like.

[ScottONeal]

@coreh, If you are looking for a new maintainer for this project, let me know. I use this module and several other do as well and would like to continue development on it, instead of duplicating it onto NPM.

Let me know how you would like to proceed with development efforts. Thanks!

[ScottONeal]

ping @coreh Hey, any chance we can some attention on this repo?