Issue #3 - Change code to work with Heroku Java Webrunner.

* As Heroku’s bundled Tomcat runner doesn’t support JNDI setup.  We need to create the eHourDataSource bean the conventional Spring way, instead of relying on JNDI.

* Add webapp-runner to pom.xml.

* Create a Procfile with path, context, port and database settings. The database values will be filled with placxeholders in this committed code.