* Uses npm to download latest swagger-js (for now. When swagger-js is
released we will replace git address with actual swagger-ui)
* Uses `postinstall` to generate `browser` folder of swagger-ui. This
can go when swagger-ui is published.
By passing parent view as an option to child views, child views can
access parent views and eventually can access model of MainView
There is alos a new domEl option available for SwaggerUI constructor.
User can send domEl instead of dom_id to specifiy which element they
want to render to
