Initial commit
Add reveal slim backend
Add data-background and data-transition-xxx options supported by revealjs
Remove file backuped for html
update backends for Asciidoctor 1.5.0 preview releases
Added 'revealjs_customtheme' attribute to specify custom theme files
minimal README for reveal.js back-end (#49)
Use reveal.js/ instead of revealjs/ for consistency with other backends
revealjs: speaker notes support in slim template + docs
revealjs: added more doc: data-background usage
revealjs: expose all configuration through attributes (w/ doc)

Took the liberty to update available configuration parameters up to
reveal.js' current master (which is stable).
revealjs: document revealjs_theme and revealjs_customtheme attributes
revealjs: fragments support with step option or role

Includes documentation. It was divided to make things clearer.
prefer step option over role for reveal.js backend
use symbol as argument to option? method
fix path to print stylesheet
revealjs: mention that the default settings come from revealjs project
revealjs: implicit listing blocks are now rendered as source code. Fixes #55

Explicit listing blocks will not be highlighted. I think this is what
most developers doing slides want.
revealjs: source highlighting documentation
revealjs: applied asciidoctor's upstream doc guidelines