Clean things up to use standard repeatable field argument instead of …

…a field option

includes/CMB2_Field.php

@@ -524,7 +524,6 @@ public function repeatable_exception( $type ) {
 			'file', // Use file_list
 			'radio',
 			'title',
-			'group',
 			// @todo Ajax load wp_editor: http://wordpress.stackexchange.com/questions/51776/how-to-load-wp-editor-through-ajax-jquery
 			'wysiwyg',
 			'checkbox',
@@ -823,7 +822,7 @@ public function replace_hash( $value ) {
 	public function options( $key = '' ) {
 		if ( ! empty( $this->field_options ) ) {
 			if ( $key ) {
-				return array_key_exists( $key, $this->field_options ) ? $this->field_options[ $key ] : NULL;
+				return array_key_exists( $key, $this->field_options ) ? $this->field_options[ $key ] : false;
 			}
 
 			return $this->field_options;
@@ -840,7 +839,7 @@ public function options( $key = '' ) {
 		}
 
 		if ( $key ) {
-			return array_key_exists( $key, $this->field_options ) ? $this->field_options[ $key ] : NULL;
+			return array_key_exists( $key, $this->field_options ) ? $this->field_options[ $key ] : false;
 		}
 
 		return $this->field_options;
@@ -867,7 +866,7 @@ public function _set_field_defaults( $args ) {
 			'default'           => null,
 			'select_all_button' => true,
 			'multiple'          => false,
-			'repeatable'        => false,
+			'repeatable'        => isset( $args['type'] ) && 'group' == $args['type'],
 			'inline'            => false,
 			'on_front'          => true,
 			'show_names'        => true,