Support files in github repos.
Upgrading to asciidoctor.js 1.5.0.preview.1
Upgrade asciidoctor.js, highlight.js and bootstrap.
Move docgist to http://gist.asciidoctor.org/
Merge pull request #1 from nawroth/patch-1

Move docgist to http://gist.asciidoctor.org/