resolves issue #198 by adding Ruby 2 compat mode.
Merge pull request #204 from lordofthejars/master

resolves issue #198 by adding Ruby 2 compat mode.
resolves issue #191 by renaming render method to convert method in AbstractBlock.
Merge pull request #205 from lordofthejars/master

resolves issue #191 by renaming render method to convert method in Abstr...
Merge branch 'master' of https://github.com/asciidoctor/asciidoctorj