Add changes from clawpack#71.

Index.ipynb

@@ -13,6 +13,7 @@
     "\n",
     "## Part I: The Riemann problem and its solution\n",
     "\n",
+    "  0. [Introduction](Introduction.ipynb)\n",
     "  1. [Advection](Advection.ipynb)\n",
     "  2. [Acoustics](Acoustics.ipynb)\n",
     "  3. [Traffic flow](Traffic_flow.ipynb)\n",

Introduction.ipynb

@@ -31,31 +31,21 @@
   {
    "cell_type": "code",
    "execution_count": null,
-   "metadata": {
-    "collapsed": false
-   },
+   "metadata": {},
    "outputs": [],
    "source": [
     "%matplotlib inline\n",
     "from exact_solvers import shallow_water\n",
-    "from ipywidgets import widgets, fixed"
+    "from ipywidgets import widgets, fixed\n",
+    "from ipywidgets import interact"
    ]
   },
   {
    "cell_type": "code",
    "execution_count": null,
-   "metadata": {},
-   "outputs": [],
-   "source": [
-    "#from ipywidgets import interact                   # for interactive widgets\n",
-    "#from utils.snapshot_widgets import interact      # for static figure that can be viewed online\n",
-    "from utils.jsanimate_widgets import interact      # for JSAnimation that can be viewed online"
-   ]
-  },
-  {
-   "cell_type": "code",
-   "execution_count": null,
-   "metadata": {},
+   "metadata": {
+    "collapsed": true
+   },
    "outputs": [],
    "source": [
     "interact(shallow_water.make_demo_plot_function(h_l=3., h_r=1., u_l=0., u_r=0),\n",

make_chapters.py

@@ -2,6 +2,7 @@
 import subprocess
 
 chapters = ['Preface',
+            'Introduction',
             'Traffic_flow',
             'Shallow_water',
             'Euler_approximate_solvers',