'/api/candidates' returns now a dummy json text.

Check
http://fii-admis-restservice-tdq5yd2mhw.elasticbeanstalk.com/api/candidates

First working version with Restlet:
- New structure for the folders that's suitable for both Maven and Java
EE aplication (to run on AWS Elastic Beanstalk or locally).
- Using Restlet 2.2.0 for Java EE applications.
- Adding a server resource that responds to /api/candidates with a dummy
josn text.
- Updating the 'index.html' page with a link to the source repository.