Update JDBC file naming in MySQL setup instruction

fix typo

Petclinic doesn't work with Java 8

so we always use the latest in the classpath

RSS is becoming outdated, JSon is a better example

- added json-path to pom.xml
- added a simple test for Veterinarians

Happens since introduction of new mvc namespace tag for
content-negotiation

There seems to be a conflict between the following:

1) New MVC namespace syntax:
<mvc:content-negotiation use-not-acceptable="true">
	    	<mvc:default-views>
	      		<bean class="org.springframework.web.servlet.view.JstlView">
	      			<property name="url" value="" />
	      		</bean>
	    	</mvc:default-views>
	  	</mvc:content-negotiation>

2) Inside my Unit test:
ResultActions actions =
this.mockMvc.perform(get("/vets.xml").accept(MediaType.TEXT_XML));
        actions.andDo(print()); // action is logged into the console

        actions.andExpect(status().isOk());

We were planning to create a ‘help’ but it never happened

Took that opportunity to use custom tag (14 lines versus 2 lines)

Previously was in session scope (doesn’t scale as well)

- 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

Also had to make changes because Spring now uses com.rometools for RSS
feeds
See here for more details: https://jira.spring.io/browse/SPR-11893