added authentication function using D2::Plugin::Auth::Extensible; new admin function to register new user; removed GET /login route - using auto_page()
fix for 'mysql server has gone away' message - new DB check_db_connection() method clears dbix object if no ping received from db, forcing dbix object recreation; wrapped 'horrible' deferred keyword in flash() method; dev logger uses Console::Colored output
switched model & app validation classes - DFV currently more suitable for model than HTML::FormHandler: eg manipulating validation profile required fields in model instead of template
