added update for folders
added folder edition
added delete for folders
add meta tags
added omniauth-github
added basic github authentication
added basic group authorization
updated basic authentication
added config.ru
added authentication controller
added root setting for assets serving
added resources controller
organize views by controller
added authentication
updated views
updated procfile
updated config.ru
procfile for heroku
added sign in button when not authorized
accept prefixes with or without trailing slash