Resizable: snap to grid

Hi

I found that snap to grid functionality, similar to the Draggable "grid" can be easily added to current Resizable implementation. The change is only 2 lines of code:

1) The first line - add grid option to the list of default options:

    //Prepare the passed options
    this.options = $.extend({
      ...
      grid: [1, 1]
    }, options);

2) The second line - calculate width/height change value using grid option - modify change() method, right after the line, where "val" is calculated:

      var change = function(a,b) {
        ...
        var val = ...
        val = val - val % o.grid[isth ? 0 : 1];

I've implemented this feature because I need it for my project. Maybe others find it useful too.

Regards,

telega