Added: postprocessing to tex elements to deal with
unprotected characters such as &, >, and <.  Testeb
by file sample3.ad.  The strings "&amp;", "&gt;"
and "&lt;" are mapped to &, >, and <.  Not a great
solution, but it works.
comments added: Merge branch 'master' of https://github.com/jxxcarlson/asciidoctor-backends