Add module 'docs' to display docs from markdown files
Add source folder of markdown files for docs
Update lib markdown

* Extract config to config file 'markdown.php'
* Add support for "prettyprint linenums" to fenced code blocks
Add scripts and styles for Google's prettify
Update ctlr docs/docs to set needed assets
Merge branch 'feature/users' into develop
Merge branch 'feature/users' into develop