native createdCallback fires immediately on element creation, befor…

…e children are processed, so <script> tag embedded in <polymer-element> is not executed when the latter is upgraded:

modify the instantiation process so that embedded definitions still work (now a `noscript` attribute is required for elements with no script portion);
factor lifecycle methods to support both `createdCallback' and `readyCallback` as we transition to the former

src/declaration/polymer-element.js

@@ -10,6 +10,8 @@
   var extend = Polymer.extend;
   var apis = scope.api.declaration;
 
+  var deferred = {};
+
   // imperative implementation: Polymer()
 
   // maps tag names to prototypes
@@ -18,6 +20,9 @@
   // register an 'own' prototype for tag `name`
   function element(name, prototype) {
     registry[name] = prototype;
+    if (deferred[name]) {
+      deferred[name].define();
+    }
   }
 
   // returns a prototype that chains to <tag> or HTMLElement
@@ -29,8 +34,24 @@
 
   var prototype = generatePrototype();
   extend(prototype, {
-    // custom element processing
+    // TODO(sjmiles): temporary BC
     readyCallback: function() {
+      this._createdCallback();
+    },
+    createdCallback: function() {
+      this._createdCallback();
+    },
+    // custom element processing
+    _createdCallback: function() {
+      // fetch our element name
+      var name = this.getAttribute('name');
+      if (registry[name] || this.hasAttribute('noscript')) {
+        this.define();
+      } else {
+        deferred[name] = this;
+      }
+    },
+    define: function() {
       // fetch our element name
       var name = this.getAttribute('name');
       // fetch our extendee name

src/instance/base.js

@@ -12,8 +12,15 @@
     // user entry point for constructor-like initialization
     ready: function() {
     },
-    // system entry point, do not override
+    // TODO(sjmiles): temporary BC
     readyCallback: function() {
+      this._createdCallback();
+    },
+    createdCallback: function() {
+      this._createdCallback();
+    },
+    // system entry point, do not override
+    _createdCallback: function() {
       //this.style.display = 'inline-block';
       // install property observers
       // do this first so we can observe changes during initialization
@@ -31,7 +38,7 @@
       // bindings will self destruct after a short time; this is 
       // necessary to make elements collectable as garbage
       // when polyfilling Object.observe
-      this.asyncUnbindAll();
+      //this.asyncUnbindAll();
       // user initialization
       this.ready();
     },