Add bower.json

Would y'all be up for adding the library to [Bower](http://bower.io)?

I got a basic `bower.json` set up. Could use some further tweaking/additions as y'all see fit! We use Bower for much of our dependency management with JavaScript libraries via [wiredep](https://github.com/taptapship/wiredep) at the Texas Tribune, so it'd be nice to add `wherewolf` to the pile of stuff that supports it.

I *did not* [register it](http://bower.io/docs/creating-packages/#register).