Fixing sort plugin method, it lives on the Grid.prototype object, and is being overshadowed by the this.sort instance-level object. Changing all references for the sort object from sort to sortDictionary to keep the public API consistent, and then moving some sort functionality from renderTableHeader out into its own function that can be called by both the click handler and the prototype.sort function, and fixing issues that popped up there.

Author: Richard Lindsey