Use of Dashboard.phtml

- 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 in controllers.
- User.php: use of 'namespace config(adapter)()' for instantiation.
- select.phtml: explode no longer needed for MySQL (see TODO).
- application.php: inclusion of layout key in config array.
- Created application.local.ph and added 'layout' key for your consideration of inclusion in application.global.php.
- Helper.php: helper class for easy formating of print_r and any other functionality we want to add in the future. Helper::pre(variable to show, message -optional-, die text if any -optional-).

TODO: implementation of an assoc array output in txt adapter for consistency between adapters.