Fix bug introduced when https://jira.spring.io/browse/ROO-3510 was fixed
ROO-3505: Upgraded to support Java 8

Updated pom to use latest antlr-java-parser library as well as the latest wrapper for the new antlr4-runtime.
Merge pull request #75 from mikedehaan/master

ROO-3505: Upgraded to support Java 8
Updated maven-site-plugin to prevent NoClassDefFoundError: org/sonatype/aether/graph/DependencyFilter during build (not seen this before)