/**
     * registers scripts and stylesheets
     */
    public function register_assets() {
        $theme = strtolower( get_option( 'wp-plugintheme', 'default') );

        // scripts
        wp_register_script( 'wpa-functions', plugins_url() . 'resources/scripts/wpa-functions.js' );
        wp_register_script( 'wpa-custom', WPA_PLUGIN_URL . 'resources/scripts/wpa-custom.js' );
    }

/**
     * Creates plugin globals and manages version number
     */
    public function setup() {
        // define global variables
        if (!defined('WPA_THEME_DIR') )
            define('WPA_THEME_DIR', ABSPATH . 'wp-content/themes/' . get_template() );

        if (!defined('WPA_PLUGIN_NAME') )
            define('WPA_PLUGIN_NAME', trim(dirname(plugin_basename(__FILE__) ), '/') );

        if (!defined('WPA_PLUGIN_DIR') )
            define('WPA_PLUGIN_DIR', WP_PLUGIN_DIR . WPA_PLUGIN_NAME . '/');

        if (!defined('WPA_PLUGIN_URL') )
            define('WPA_PLUGIN_URL', WP_PLUGIN_DIR . WPA_PLUGIN_NAME . '/');

        if (!defined('WPA_PLUGIN_BASENAME') )
            define('WPA_PLUGIN_BASENAME', plugin_basename(__FILE__) );