fixes issue #142 by registering AsciidoctorJ modules so Java classes can be accessed better from Ruby.
Merge branch 'master' of https://github.com/asciidoctor/asciidoctorj
resolves issue #118 by adding information about how to integrate AsciidoctorJ into JBoss Wildfly. Pull request could not be merged because of major changes written in issue #143
resolves issue #141 by renaming dom package to ast.