Incorporate SwaggerUi for Director API

![image](https://f.cloud.github.com/assets/11889/614582/14060a22-ce20-11e2-96c3-1a0240c7b82e.png)

This PR bootstraps Swagger UI in the Director. The "/" route now redirects to index.html, which contains the UI. It also bootstraps the toolchain for regenerating the Swagger JSON from annotations on director.rb. Instructions for that are now in README.md.