update elements and fix some bugs

lib/iron_icon.dart

 // DO NOT EDIT: auto-generated with `pub run custom_element_apigen:update`
 
 /// Dart API for the polymer element `iron_icon`.
 @HtmlImport('iron_icon_nodart.html')
 library polymer_elements.lib.src.iron_icon.iron_icon;
 
 import 'dart:html';
 import 'dart:js' show JsArray, JsObject;
 import 'package:web_components/web_components.dart';
 import 'package:polymer_interop/polymer_interop.dart';
@@ skipping 31 matching lines @@
 ///     <link rel="import" href="/components/iron-icons/communication-icons.html">
 ///
 ///     <iron-icon icon="communication:email"></iron-icon>
 ///
 /// You can also create custom icon sets of bitmap or SVG icons.
 ///
 /// Example of using an icon named `cherry` from a custom iconset with the ID `fruit`:
 ///
 ///     <iron-icon icon="fruit:cherry"></iron-icon>
 ///
-/// See [iron-iconset](#iron-iconset) and [iron-iconset-svg](#iron-iconset-svg) for more information about
+/// See [iron-iconset](iron-iconset) and [iron-iconset-svg](iron-iconset-svg) for more information about
 /// how to create a custom iconset.
 ///
-/// See [iron-icons](https://elements.polymer-project.org/elements/iron-icons?view=demo:demo/index.html) for the default set of icons.
+/// See the [iron-icons demo](iron-icons?view=demo:demo/index.html) to see the icons available
+/// in the various iconsets.
 ///
 ///
 /// ### Styling
 ///
 /// The following custom properties are available for styling:
 ///
 /// Custom property | Description | Default
 /// ----------------|-------------|----------
 /// `--iron-icon-width` | Width of the icon | `24px`
 /// `--iron-icon-height` | Height of the icon | `24px`
+/// `--iron-icon-fill-color` | Fill color of the svg icon | `currentcolor`
+/// `--iron-icon-stroke-color` | Stroke color of the svg icon | none
 @CustomElementProxy('iron-icon')
 class IronIcon extends HtmlElement with CustomElementProxyMixin, PolymerBase {
   IronIcon.created() : super.created();
   factory IronIcon() => new Element.tag('iron-icon');
 
   /// The name of the icon to use. The name should be of the form:
   /// `iconset_name:icon_name`.
   String get icon => jsElement[r'icon'];
   set icon(String value) { jsElement[r'icon'] = value; }
 
   /// If using iron-icon without an iconset, you can set the src to be
   /// the URL of an individual icon image file. Note that this will take
   /// precedence over a given icon attribute.
   String get src => jsElement[r'src'];
   set src(String value) { jsElement[r'src'] = value; }
 
   /// The name of the theme to used, if one is specified by the
   /// iconset.
   String get theme => jsElement[r'theme'];
   set theme(String value) { jsElement[r'theme'] = value; }
 }