Add option for notification: onclick

[koosvanderkolk]

I wanted to be able to add an 'onclick' event to notifications, which I accomplished by adding this code to the Gritter.add function (around line 180)

      //Bind onclick handler if provided in params      
      if ($.isFunction(params.onclick)) {
        $(item).bind('click', function(event){
          params.onclick.call(event, item);
        });
      };           

      // Clicking (X) makes the perdy thing close
      $(item).find('.gritter-close').click(function(e){
        Gritter.removeSpecific(number, {}, null, true);

        //make sure that onclick function of item is not called
        e.preventDefault();
        return false;
      });

I had to modify the close button function, because clicking the close button would cause annoying event bubbling...