added a Spring Data implementation

- there are now 3 data access implementations (jdbc, jpa and
spring-data-jpa)
- added corresponding bean profiles
- JUnit tests are now successful

src/main/webapp/WEB-INF/jsp/pets/createOrUpdatePetForm.jsp

@@ -55,9 +55,6 @@
 				</fieldset>	
 			</form:form>	
 			<c:if test="${!pet['new']}">
-			  <form:form method="delete">
-			    <p class="submit"><input type="submit" value="Delete Pet"/></p>
-			  </form:form>
 			</c:if>    
 			<jsp:include page="../footer.jsp"/>
   	</div>