Introducing Swagger to peloton

This PR is about introducing Swagger to Zeppelin

The idea is to have a implementation for describing, producing, consuming, and visualizing zeppelin RESTful service.

 * [ ] Add swagger dependencies to zeppelin
 * [ ] Add swagger servlet
 * [ ] Add swagger-api notation to the actual rest services (ZQL ZAN)
 * [ ] Add swagger-ui - with zeppelin colr (bleu)
 * [ ] Write test to make sure noting is broke and running :smile: