remove old reference to pylab

Let's see if this breaks the json

Author: CamDavidsonPilon

Prologue/Prologue.ipynb

@@ -9,7 +9,6 @@
    "cells": [
     {
      "cell_type": "markdown",
-     "metadata": {},
      "source": [
       "Probabilistic Programming and \n",
       "=====\n",
@@ -116,7 +115,6 @@
       "    -  IPython 0.13 is a requirement to view the ipynb files. It can be downloaded [here](http://ipython.org/)\n",
       "    -  For Linux users, you should not have a problem installing Numpy, Scipy, Matplotlib and PyMC. For Windows users, check out [pre-compiled versions](http://www.lfd.uci.edu/~gohlke/pythonlibs/) if you have difficulty. \n",
       "    -  In the styles/ directory are a number of files (.matplotlirc) that used to make things pretty. These are not only designed for the book, but they offer many improvements over the default settings of matplotlib and the IPython notebook.\n",
-      "    -  while technically not required, it may help to run the IPython notebook with `--pylab inline` if you encounter runtime errors.\n",
       "2. The second, preferred, option is to use the nbviewer.ipython.org site, which display IPython notebooks in the browser ([example](http://nbviewer.ipython.org/urls/raw.github.com/CamDavidsonPilon/Probabilistic-Programming-and-Bayesian-Methods-for-Hackers/master/Chapter1_Introduction/Chapter1.ipynb)).\n",
       "The contents are updated synchronously as commits are made to the book. You can use the Contents section above to link to the chapters.\n",
       " \n",