Slider: Corrected range option setter. Refactored _create() code to make

portions accessible to both it and setter method.  Fixes #5602 - slider: Slider 
Does Not Exhibit Proper Behavior When Switching Range

Author: lthibodeaux

ui/jquery.ui.slider.js

@@ -391,7 +391,7 @@ $.widget( "ui.slider", $.ui.mouse, {
 				this._refreshRange();
 				this._refreshHandles();
 				this._refreshValue();
-				this._animateOn = true;
+				this._animateOff = false;
 				break;
 			case "value":
 				this._animateOff = true;