Add factor-bundle support

[pcfreak30]

It adds the browser.js but not the css data.

[cheton]

Hi @pcfreak30,

You can simply use var browserifyCSS = require('browserify-css'); if you want to require only the browser.js.

If you want to output CSS to a another file instead of embedding it into a JS bundle, you can check out the onFlush option at https://github.com/cheton/browserify-css#onflush.

[pcfreak30]

I found a hack to get it working but I wanted it embedded in the common bundle via factor.