Added FlashMessage class which allows you to create and display HTML messages
    with HTML classes
Created FlashMessageFactory to allow you to create preset FlashMessages such
    as WarningMessage, AlertMessage and SuccessMessage
Created a Strings class which can contain localised versions of strings
Added a login system to the UserController
Updated the Guest Filter to show a WarningMessage
Added a psr-0 class loader path to the composer.json file for loading helper
    classes located in app/Cms folder
Added a simple stylesheet to public/css