add missing implementation for twig extension
add missing implementation for twig extension

OskarStark/pixSortableBehaviorBundle,1ed/pixSortableBehaviorBundle,pix-digital/pixSortableBehaviorBundle,OskarStark/pixSortableBehaviorBundle,pix-digital/pixSortableBehaviorBundle,pix-digital/pixSortableBehaviorBundle