- autoload.php: changed directory separator writing  to fit any platform (DIRECTORY_SEPARATOR).
- application.global.php: changed 'db' for 'adapter' to reflect new paradigm.
- usuarios.php: changed name of method select to index to reflect a common ground for default method.
- User.php: namespace config(adapter) for instantiation.
- select.phtml: explode no longer need for MySQl.
- application.php: inclusion of layout key in config array.
- Helper.php: helper class for easy formating of print_r and any other functionality we want to add in the future.

TODO: implement assoc array output in txt adapter for consistency between adapters.