Implement browserify for dependency management

[modulitos]

Let's load our Javascript dependencies as modules using the CommonJS module implementation Browserify.

This would be very useful for our static file collection and would help clean up some of the views. We should push it upstream to Shareabouts as well.

[Bilal-io]

Good reference:
Browserify Handbook

[modulitos]

We might want to use this module for Browserify integration with Django: https://github.com/j0hnsmith/django-pipeline-browserify
And here is a nice guide as well: http://gregblogs.com/how-django-reactjs-and-browserify/

[modulitos]

This was resolved in #604