Shows timing issue when using Urth Polymer import. See https://github.com/jupyter-incubator/declarativewidgets/issues/25

polymer-import-timing-issue.ipynb

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   "source": [
    "from urth.widgets.widget_channels import channel"
   ]
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    "%%html\n",
    "<link rel=\"import\" href=\"./static/urth_components/paper-toggle-button/paper-toggle-button.html\"\n",
    "    is=\"urth-core-import\" package=\"PolymerElements/paper-toggle-button\">\n"
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   "source": [
    "## comment out these lines as a \"workaround\" for the timing issue\n",
    "# import time\n",
    "# time.sleep(1)"
   ]
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    "%%html\n",
    "\n",
    "<dom-module id=\"dynamic-list\">\n",
    "    <template>\n",
    "        <paper-toggle-button checked=\"{{liveUpdate}}\"></paper-toggle-button>\n",
    "    </template>\n",
    "\n",
    "    <script>\n",
    "    (function () {\n",
    "        'use strict';\n",
    "\n",
    "        Polymer({\n",
    "            is: 'dynamic-list',\n",
    "\n",
    "            properties: {\n",
    "                liveUpdate: {\n",
    "                    type: Boolean,\n",
    "                    value: true,\n",
    "                    observer: '_liveUpdateChanged'\n",
    "                }\n",
    "            },\n",
    "\n",
    "            _liveUpdateChanged: function(newVal, oldVal) {\n",
    "                console.log('live update:',this.liveUpdate);\n",
    "            }\n",
    "        });\n",
    "    })();\n",
    "    </script>\n",
    "</dom-module>\n",
    "\n",
    "<dynamic-list></dynamic-list>\n"
   ]
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