moved customizations to proper locations
adding AsciiDoctor functionality

* add to Gemfile
* bundle install
* add to plugins directory
* added configuration to config

based on:
* https://twitter.com/mojavelinux/status/392748715506548736
* https://github.com/asciidoctor/jekyll-asciidoc
moved customizations to proper locations
Merge branch 'feature/addAsciiDoc' into source