- remove custom xml view, use springboot builtin xml view
- remove oxm maven dependency
- remove json-simple maven dependency (seems not relevant anymore)
- update vetsXml test using xpath

This reverts commit 4b1f7a7a.

#121

CallMonitoringAspect is not invoked when spring-data-jpa is used.  Spent
4 hours trying to understand why jmx bean wasn't showing message counts.
Use JPA or JDBC if you want call counts exposed via JMX / AOP

Petclinic doesn't work with Java 8

RSS is becoming outdated, JSon is a better example