Downgrade JDK version to JDK 7
Without JDK 8 features. Replaced lambdas by inner anonymous classes, made interfaces more specific
Removed debugging code (no System.err.println).
Upgrade the ASCIIDoc version. Work around the GroovyDoc dependency issue.
Added Rafal to the Credits section of the guides
Merge commit '1edbd88b0a6098efd9115802f06585fbfdee77c5' into jdk8
Merge branch 'master' into jdk8