[polymer] import all elements

pkg/polymer/lib/elements/polymer-animation/polymer-animation-keyframe.html

+<link rel="import" href="../polymer/polymer.html">
+
+<polymer-element name="polymer-animation-keyframe" attributes="offset value easing">
+        <script>
+                /**
+     * Defines a keyframe in an animation. Its children should be
+     * `<polymer-animation-prop>` elements specifying the css
+     * property value at the keyframe.
+     *
+                 * @class polymer-animation-keyframe
+                 */
+                /**
+                 * From 0 to 1.
+                 * @property offset
+                 * @type Number
+                 */
+                Polymer('polymer-animation-keyframe', {
+                        get properties() {
+        var props = {};
+        var children = this.querySelectorAll('polymer-animation-prop');
+        Array.prototype.forEach.call(children, function(c) {
+          props[c.name] = c.value;
+        });
+                                if (this.offset !== null) {
+                                        props.offset = this.offset;
+                                }
+                                return props;
+                        }
+                });
+        </script>
+</polymer-element>
+