OGM-651 Disable documentation build for JDK 9

  The build fails with JDK 9 because the asciidoctor maven plugin
  throw an exception when it detects the JDK 9
OGM-651 Enforce JDK 7 or JDK 8 for distribution module

  We are currently not building the documentation with JDK 9.
  We want to avoid a release without a documentation.
OGM-651 Change Emmanuel email in the signature

  Otherwise doclint will complain
OGM-651 Fixing JavaDoc issues in core
OGM-651 Fix javadoc to pass doclint checks