Update ctrl users/_admin/logout to not load unnecessary helpers
Add basic logout controller for registered users
Update routes for 'login', 'logout', and 'registration' to nicer regex-format
Finally delete incorrectly named migration files
Add migration 018_Add_user_codes_table
Merge branch 'develop' into feature/users
Merge branch 'develop' into feature/users
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
Update login forms and lib users/Auth

* One form for login and admin/login used
* Re-confirm login on admin/login if user logged in, otherwise presents default login-form
Update config routes for login forms
Update core/Admin_Controller to check for logged_in_admin
Merge branch 'feature/users' into develop