Debugging option

These changes add debug support for cleaver. Too often have I run into issues with loading themes (or any resources for that matter), where I need to crawl down the rabbit hole to figure out what's failing. I've brought in [TJ](http://github.com/visionmedia)'s [debug](https://github.com/visionmedia/debug) module to help with this task. 

The result is really nice!

![screen shot 2014-04-26 at 12 34 44 am](https://cloud.githubusercontent.com/assets/287268/2807875/2421c988-ccfc-11e3-841b-ff70e3b39db4.png)

This flag will also enable full stack traces when errors crop up.

To use it yourself, just specify the `--debug` flag when running the cleaver command. I'll also bump the version here to push out a new patch release.