Update sortable.js
Update sortable.js

I have updated this file for the following:
1.) Added an accessor attribute that allows you to call the resort option from the controller.  The reason behind this is because if the items in which you are sorting are sitting inside a directive, then you have to wait until the Dom completely loads before you can see all of the sortable items.  This is because the templates for the directives haven't been updated yet.  So none of the dom elements or the CSS has been loaded.
2.) I have moved the check for ngModel inside each of the callback function.  There are ways with simply divs to not have to use ngModel with ui-sort.  With it coded this way you can still attach on custom listeners and keep all of the same functionality of the ngModel usage.
3.) Cleaned up and commented code.
MCKRUZ/ui-sortable,MCKRUZ/ui-sortable