update elements and fix some bugs

lib/iron_range_behavior.dart

 // DO NOT EDIT: auto-generated with `pub run custom_element_apigen:update`
 
 /// Dart API for the polymer element `iron_range_behavior`.
 @HtmlImport('iron_range_behavior_nodart.html')
 library polymer_elements.lib.src.iron_range_behavior.iron_range_behavior;
 
 import 'dart:html';
 import 'dart:js' show JsArray, JsObject;
 import 'package:web_components/web_components.dart';
 import 'package:polymer_interop/polymer_interop.dart';
@@ skipping 12 matching lines @@
 
   /// Returns the ratio of the value.
   num get ratio => jsElement[r'ratio'];
   set ratio(num value) { jsElement[r'ratio'] = value; }
 
   /// Specifies the value granularity of the range's value.
   num get step => jsElement[r'step'];
   set step(num value) { jsElement[r'step'] = value; }
 
   /// The number that represents the current value.
-  num get value => jsElement[r'value'];
-  set value(num value) { jsElement[r'value'] = value; }
+  get value => jsElement[r'value'];
+  set value(value) { jsElement[r'value'] = (value is Map || (value is Iterable && value is! JsArray)) ? new JsObject.jsify(value) : value;}
 }