add handlers on node insertion
add handlers on node insertion

fabriziobertoglio1987/railsmentor,ArtOfCode-/qpixel,ArtOfCode-/qpixel,ArtOfCode-/qpixel,fabriziobertoglio1987/railsmentor,fabriziobertoglio1987/railsmentor,ArtOfCode-/qpixel