RSS is becoming outdated, JSon is a better example

- Now using namespace, much simpler (11 lines instead of 27)
- Just a minor issue with:
<bean class="org.springframework.web.servlet.view.JstlView">
	<property name="url" value="" />
</bean>
(should investigate later if we can remove “url” attribute

 * The old datatables-servlet2 dependency has been removed from the pom.xml
 * Some attributes have been renamed (e.g. paginate => pageable)
 * Starting from the v0.10.0, all web components (servlet, filter) must be explicitely declared in the web.xml file. That's why I added the following declaration: DandelionFilter, DandelionServlet and DatatablesFilter
 * Added a new datatables.properties file in order to disable the asset management brought by Dandelion-Core. This is equivalent to the old cdn=true table attribute

jdbc.properties was renamed to data-access.properties, but this file still referred to the old name.

Spring MVC should server static resources (*.html, ...) located in src/main/webapp instead of returning "404 Not Found"

see: https://jira.springsource.org/browse/DATAJPA-292

Transactions should be on the root application context (or Hibernate will not be able to persist entities)

- integrated Gordon's comments in the POM
- removed antlr from the POM that we don't need anymore
- changed webjars versions inside headTag.jsp

Changed the birth date for all the pets (so we do not have a 12 year
old hamster where their life expectancy is 2-3 years :)  )

In that way we don't need a dedicated config file for the Service layer

see https://jira.springsource.org/browse/DATAJPA-292