Update readme.md

Updates the jsp url for the sample usage in JSP

- updated some links
- removed some broken links

Fixed some typos in comments

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RSS is becoming outdated, JSon is a better example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());