[Example] Add iframe example plugin

Add example plugin with iframe; relates to WTD-1030, generally.

example/iframe/bundle.json

@@ -0,0 +1,33 @@
+{
+    "extensions": {
+        "types": [
+            {
+                "key": "example.page",
+                "name": "Page",
+                "features": [ "creation" ],
+                "properties": [
+                    {
+                        "key": "url",
+                        "name": "URL",
+                        "control": "textfield"
+                    }
+                ]
+            }
+        ],
+        "views": [
+            {
+                "templateUrl": "iframe.html",
+                "name": "Page",
+                "type": "example.page",
+                "key": "example.page"
+            }
+        ],
+        "controllers": [
+            {
+                "key": "IFrameController",
+                "implementation": "IFrameController.js",
+                "depends": ["$sce"]
+            }
+        ]
+    }
+}

example/iframe/res/iframe.html

@@ -0,0 +1,4 @@
+<iframe ng-controller="IFrameController as ctl"
+        style="width: 100%; height: 100%;"
+        ng-src="{{ctl.trust(model.url)}}">
+</iframe>

example/iframe/src/IFrameController.js

@@ -0,0 +1,19 @@
+/*global define*/
+
+define(
+    [],
+    function () {
+        "use strict";
+
+        function Controller($sce) {
+            return {
+                trust: function (url) {
+                    return $sce.trustAsResourceUrl(url);
+                }
+            };
+        }
+
+        return Controller;
+    }
+
+);