BUG: Browserify outputs three underscores.

Currently, we want to use `lodash.underscore.js` for https://github.com/FormidableLabs/notes/tree/master/full/browserify.  However, after the following:

```
$ cd full/browserify
$ npm install
$ grunt browserify:dist
```

We can see three underscores (from bb, bb.localStorage, and from lodash):

```
$ grep "Underscore.js 1" app/js-dist/bundle.js 
//     Underscore.js 1.4.4
//     Underscore.js 1.6.0
 * Based on Underscore.js 1.5.2 <http://underscorejs.org/LICENSE>
```

Ideally `browserify-swap` takes care of this, but it is not working in current form...

Hopefully we can work the issue #43 out in this PR...