update elements and fix some bugs

lib/src/iron-icon/iron-icon.html

Index: lib/src/iron-icon/iron-icon.html
diff --git a/lib/src/iron-icon/iron-icon.html b/lib/src/iron-icon/iron-icon.html
index b7dedd14b88db7438230a9757b93317fc9210a70..ff4951d4db39eb0b6f8ad0e633fb071fc9e957d6 100644
--- a/lib/src/iron-icon/iron-icon.html
+++ b/lib/src/iron-icon/iron-icon.html
@@ -52,10 +52,11 @@ 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
@@ -66,6 +67,8 @@ 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
 
 @group Iron Elements
 @element iron-icon
@@ -84,7 +87,8 @@ Custom property | Description | Default
 
       vertical-align: middle;
 
-      fill: currentcolor;
+      fill: var(--iron-icon-fill-color, currentcolor);
+      stroke: var(--iron-icon-stroke-color, none);
 
       width: var(--iron-icon-width, 24px);
       height: var(--iron-icon-height, 24px);
@@ -129,11 +133,14 @@ Custom property | Description | Default
           type: String,
           observer: '_srcChanged'
         },
-        
+
+        /**
+         * @type {!Polymer.IronMeta}
+         */
         _meta: {
           value: Polymer.Base.create('iron-meta', {type: 'iconset'})
         }
-        
+
       },
 
       _DEFAULT_ICONSET: 'icons',
@@ -157,12 +164,13 @@ Custom property | Description | Default
       _updateIcon: function() {
         if (this._usesIconset()) {
           if (this._iconsetName) {
-            this._iconset = this._meta.byKey(this._iconsetName);
+            this._iconset = /** @type {?Polymer.Iconset} */ (
+              this._meta.byKey(this._iconsetName));
             if (this._iconset) {
               this._iconset.applyIcon(this, this._iconName, this.theme);
+              this.unlisten(window, 'iron-iconset-added', '_updateIcon');
             } else {
-              this._warn(this._logf('_updateIcon', 'could not find iconset `'
-                + this._iconsetName + '`, did you import the iconset?'));
+              this.listen(window, 'iron-iconset-added', '_updateIcon');
             }
           }
         } else {