npm_modules: Fork bower_components into Polymer 0.4.0 and 0.5.0 versions

bower_components/core-signals/core-signals.html

-<!--
-Copyright (c) 2014 The Polymer Project Authors. All rights reserved.
-This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE
-The complete set of authors may be found at http://polymer.github.io/AUTHORS
-The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS
-Code distributed by Google as part of the polymer project is also
-subject to an additional IP rights grant found at http://polymer.github.io/PATENTS
--->
-<link rel="import" href="../polymer/polymer.html">
-
-<!--
-`core-signals` provides basic publish-subscribe functionality.
-
-Note: avoid using `core-signals` whenever you can use
-a controller (parent element) to mediate communication
-instead.
-
-To send a signal, fire a custom event of type `core-signal`, with
-a detail object containing `name` and `data` fields.
-
-    this.fire('core-signal', {name: 'hello', data: null});
-    
-To receive a signal, listen for `core-signal-<name>` event on a 
-`core-signal` element.
-
-  <core-signal on-core-signal-hello="{{helloSignal}}">
-
-You can fire a signal event from anywhere, and all 
-`core-signal` elements will receive the event, regardless
-of where they are in DOM.
-
-@group Polymer Core Elements
-@element core-signals
-@status stable
-@homepage github.io
--->
-<polymer-element name="core-signals">
-<script>
-(function(){
-  
-  Polymer({
-    attached: function() {
-      signals.push(this);
-    },
-    removed: function() {
-      var i = signals.indexOf(this);
-      if (i >= 0) {
-        signals.splice(i, 1);
-      }
-    }
-  });
-
-  // private shared database
-  var signals = [];
-
-  // signal dispatcher
-  function notify(name, data) {
-    // convert generic-signal event to named-signal event
-    var signal = new CustomEvent('core-signal-' + name, {
-      // if signals bubble, it's easy to get confusing duplicates
-      // (1) listen on a container on behalf of local child
-      // (2) some deep child ignores the event and it bubbles 
-      //     up to said container
-      // (3) local child event bubbles up to container
-      // also, for performance, we avoid signals flying up the
-      // tree from all over the place
-      bubbles: false,
-      detail: data
-    });
-    // dispatch named-signal to all 'signals' instances,
-    // only interested listeners will react
-    signals.forEach(function(s) {
-      s.dispatchEvent(signal);
-    });
-  }
-
-  // signal listener at document
-  document.addEventListener('core-signal', function(e) {
-    notify(e.detail.name, e.detail.data);
-  });
-  
-})();
-</script>
-</polymer-element>