working sync for widget height

Author: zakandrewking

docs/notebooks/Escher Widget Example.ipynb

@@ -2,27 +2,27 @@
  "cells": [
   {
    "cell_type": "code",
-   "execution_count": 5,
+   "execution_count": 6,
    "metadata": {},
    "outputs": [],
    "source": [
-    "from escher.widget import EscherWidget"
+    "from escher import Builder"
    ]
   },
   {
    "cell_type": "code",
-   "execution_count": 6,
+   "execution_count": 7,
    "metadata": {},
    "outputs": [
     {
      "data": {
       "application/vnd.jupyter.widget-view+json": {
-       "model_id": "4cf4a15a97ce4f1ebcf826a9810432dc",
+       "model_id": "061fb98e687a49709f483c739ebe9b42",
        "version_major": 2,
        "version_minor": 0
       },
       "text/html": [
-       "<p>Failed to display Jupyter Widget of type <code>EscherWidget</code>.</p>\n",
+       "<p>Failed to display Jupyter Widget of type <code>Builder</code>.</p>\n",
        "<p>\n",
        "  If you're reading this message in the Jupyter Notebook or JupyterLab Notebook, it may mean\n",
        "  that the widgets JavaScript is still loading. If this message persists, it\n",
@@ -37,15 +37,15 @@
        "</p>\n"
       ],
       "text/plain": [
-       "EscherWidget()"
+       "Builder(widget_height='100px')"
       ]
      },
      "metadata": {},
      "output_type": "display_data"
     }
    ],
    "source": [
-    "EscherWidget()"
+    "Builder()"
    ]
   },
   {