Configuration for adapter.js registered on Bower

[To register a package in Bower](http://bower.io/docs/creating-packages/#register) don't require any aditional permission since it works mostly as a URL shortener point to git repositories and it can be done by anybody, so I've already register it and it's already available. This file contains the metadata required by the [Bower registry](http://bower.io/search/) so the package can be easily indexable and also only download the required adapter.js file and no other files from this repo.

This fix issue #104.
Sorry, it's a json file, it's not possible to add comment there :-(