Initial implementation of Dashbuilder's REST and Javascript API with examples

This is the initial implementation of the REST API for embedding Dashbuilder's charts and reports into any web application, as well as the simple Javascript wrapper that takes care of making it a simple task.

Usage examples to check functionality can be accessed by using the following URLs:

http://localhost:8080/dashbuilder/js-api/demo1.html
http://localhost:8080/dashbuilder/js-api/demo2.html