Cleanup for demo

@choppen5 & @voiceittech,

I've cleaned up and refactored a bit, most of it is jammed into d7903b7.

* Use [Gulp](http://gulpjs.com/) for JS lint & [Docco](https://jashkenas.github.io/docco/) builds.
* Reformatted tabs, et. al to [Felix's Node Style](http://nodeguide.com/style.html).
* Renamed a number of variables `resp` to `twiml` for instance, so it's more representative of what it is. Removing the need having to brain train `res`, `resp`, `response`, based on what thing is being handled.
* Ensured all variables are prefixed with `var`.

It's pretty close, I, think, to prime time.