Configure animal-sniffer-maven-plugin to fail when new unsupported JDK APIs are used

Benson gave us a great little pointer to http://www.mojohaus.org/animal-sniffer/animal-sniffer-maven-plugin/

We should configure this plugin to run during our build to catch when we accidentally use JDK APIs which only exist in a newer version of Java than what we target for a specific release line.

For example, mid-2016, we have problems with JDK8 APIs slipping into release lines which still need to support JDK7. We had a similar problem when switching from JDK6 to JDK7.