Changed drupalgap_menu_access() to allow access_callback functions to have arguments, or no arguments.
Changed the 404 page to accept no arguments and added a 401 page.
Changed the header theme and pixed the footers position.
Added user_register_access(). Added registration completion messages to the user_register_form() form json object. Changed user_register_form_submit() to auto login users when e-mail verification is not required, and no administrator approval is required, and added informative messages for other registration scenarios.