clean up ProgressBar class in example notebook

- remove (obviously outdated) ipython special handling
- thus, make it work outside ipython (as promised)
- add sleep (import was already there) to beautify

docs/examples/notebooks/Animations_and_Progress.ipynb

@@ -204,25 +204,16 b''
      "collapsed": true,
      "input": [
       "import sys, time\n",
-      "try:\n",
-      "    from IPython.display import clear_output\n",
-      "    have_ipython = True\n",
-      "except ImportError:\n",
-      "    have_ipython = False\n",
       "\n",
       "class ProgressBar:\n",
       "    def __init__(self, iterations):\n",
       "        self.iterations = iterations\n",
       "        self.prog_bar = '[]'\n",
       "        self.fill_char = '*'\n",
-      "        self.width = 40\n",
+      "        self.width = 50\n",
       "        self.__update_amount(0)\n",
-      "        if have_ipython:\n",
-      "            self.animate = self.animate_ipython\n",
-      "        else:\n",
-      "            self.animate = self.animate_noipython\n",
       "\n",
-      "    def animate_ipython(self, iter):\n",
+      "    def animate(self, iter):\n",
       "        print '\\r', self,\n",
       "        sys.stdout.flush()\n",
       "        self.update_iteration(iter + 1)\n",
@@ -254,19 +245,12 b''
      "input": [
       "p = ProgressBar(1000)\n",
       "for i in range(1001):\n",
+      "    time.sleep(0.002)\n",
       "    p.animate(i)"
      ],
      "language": "python",
      "metadata": {},
      "outputs": []
-    },
-    {
-     "cell_type": "code",
-     "collapsed": false,
-     "input": [],
-     "language": "python",
-     "metadata": {},
-     "outputs": []
     }
    ],
    "metadata": {}