wip functions for creating registration forms and embedding via shortcode
check for theme template that starts with 'largo' so we can be more flexible when it comes to the theme directory's name
even better, don't hardcode the check for theme template name, since this code will only run if largo is active anyway
more work on the default reigstration form
make sure we check the origin of the form submission before processing registration
wrap the nonce error message in some markup
whoops, only check the nonce when request is a POST
remove some debugging code
add a bunch of documentation to registration code, make it so that custom/extra field values can be passed back to the form if validation fails