, by @comolosabia
 *        Add TimeSeries.clear function, by @drewnoakes
 * v1.26: Add support for resizing on high device pixel ratio screens, by @copacetic
 * v1.27: Fix bug introduced in v1.26 for non whole number devicePixelRatio values, by @zmbush
 * v1.28: Add 'minValueScale' option, by @megawac
 *        Fix 'labelPos' for different size of 'minValueString' 'maxValueString', by @henryn
 */

;(function(exports) {

  var Util = {
    extend: function() {
      arguments[0] = arguments[0] || {};
      