Add heroku deployment intructions
Use casperjs and slimerjs for integration tests

* Introduces a proxy endpoint for github requests
* Replaces jsdom tests
* Exercises WebGL
Make asset paths absolute
Introduce OAuth flow

* Adds a template renderer and router
* Connect middleware to map repo paths to static html
* Middleware to bypass OAuth dance in integration
* Middleware to add OAuth access token to proxied API calls
* Uses non SSL connection when on localhost