ISIS-437: updating restful objects viewer pom parents...

... to be isis-core-1.3.0.
Also:
- removing jaxrs/pom.xml (not a module)
[maven-release-plugin] prepare release isis-viewer-restfulobjects-2.1.0
[maven-release-plugin] prepare for next development iteration
ISIS-437: updating shiro security pom parent...

... to be isis-core 1.3.0
[maven-release-plugin] prepare release isis-security-shiro-1.3.0
[maven-release-plugin] prepare for next development iteration