Updated pom to pull in gateway.client.java new version, removed groupId because it is redundant (it's inherited by default), cleaned up parent version and versions of plugins for release to maven central
Updated pom to pull in gateway.client.java new version, removed groupId because it is redundant (it's inherited by default), cleaned up parent version and versions of plugins for release to maven central

kaazing-build/java.client,kaazing/java.client,michaelcretzman/java.client,michaelcretzman/java.client,kaazing/java.client,kaazing-build/java.client,AdrianCozma/java.client,AdrianCozma/java.client