Keep order when adding options to sortable
Keep order when adding options to sortable

Also clean up comments at the top

axpauls/tree-multiselect.js,axpauls/tree-multiselect.js,faisalk08/tree-multiselect.js,patosai/tree-multiselect.js,Lywangwenbin/tree-multiselect.js,patosai/tree-multiselect.js,patosai/tree-multiselect.js,Lywangwenbin/tree-multiselect.js,faisalk08/tree-multiselect.js