Updated notebook footer.

Author: rossant

notebooks/chapter01_basic/01_notebook.ipynb

@@ -408,7 +408,7 @@
      "source": [
       "> You'll find all the explanations, figures, references, and much more in the book (to be released later this summer).\n",
       "\n",
-      "> [IPython Cookbook](http://ipython-books.github.io/), by [Cyrille Rossant](http://cyrille.rossant.net), Packt Publishing, 2014 (400 pages). [Get a 50% discount by pre-ordering now](http://www.packtpub.com/ipython-interactive-computing-and-visualization-cookbook/book) with the code `mK00gPxQM` (time-limited offer)!\n"
+      "> [IPython Cookbook](http://ipython-books.github.io/), by [Cyrille Rossant](http://cyrille.rossant.net), Packt Publishing, 2014 (500 pages)."
      ]
     }
    ],

notebooks/chapter01_basic/02_pandas.ipynb

@@ -270,7 +270,7 @@
      "source": [
       "> You'll find all the explanations, figures, references, and much more in the book (to be released later this summer).\n",
       "\n",
-      "> [IPython Cookbook](http://ipython-books.github.io/), by [Cyrille Rossant](http://cyrille.rossant.net), Packt Publishing, 2014 (400 pages). [Get a 50% discount by pre-ordering now](http://www.packtpub.com/ipython-interactive-computing-and-visualization-cookbook/book) with the code `mK00gPxQM` (time-limited offer)!\n"
+      "> [IPython Cookbook](http://ipython-books.github.io/), by [Cyrille Rossant](http://cyrille.rossant.net), Packt Publishing, 2014 (500 pages)."
      ]
     }
    ],

notebooks/chapter01_basic/03_numpy.ipynb

@@ -309,7 +309,7 @@
      "source": [
       "> You'll find all the explanations, figures, references, and much more in the book (to be released later this summer).\n",
       "\n",
-      "> [IPython Cookbook](http://ipython-books.github.io/), by [Cyrille Rossant](http://cyrille.rossant.net), Packt Publishing, 2014 (400 pages). [Get a 50% discount by pre-ordering now](http://www.packtpub.com/ipython-interactive-computing-and-visualization-cookbook/book) with the code `mK00gPxQM` (time-limited offer)!\n"
+      "> [IPython Cookbook](http://ipython-books.github.io/), by [Cyrille Rossant](http://cyrille.rossant.net), Packt Publishing, 2014 (500 pages)."
      ]
     }
    ],

notebooks/chapter01_basic/04_magic.ipynb

@@ -217,7 +217,7 @@
      "source": [
       "> You'll find all the explanations, figures, references, and much more in the book (to be released later this summer).\n",
       "\n",
-      "> [IPython Cookbook](http://ipython-books.github.io/), by [Cyrille Rossant](http://cyrille.rossant.net), Packt Publishing, 2014 (400 pages). [Get a 50% discount by pre-ordering now](http://www.packtpub.com/ipython-interactive-computing-and-visualization-cookbook/book) with the code `mK00gPxQM` (time-limited offer)!\n"
+      "> [IPython Cookbook](http://ipython-books.github.io/), by [Cyrille Rossant](http://cyrille.rossant.net), Packt Publishing, 2014 (500 pages)."
      ]
     }
    ],

notebooks/chapter01_basic/05_config.ipynb

@@ -243,7 +243,7 @@
      "source": [
       "> You'll find all the explanations, figures, references, and much more in the book (to be released later this summer).\n",
       "\n",
-      "> [IPython Cookbook](http://ipython-books.github.io/), by [Cyrille Rossant](http://cyrille.rossant.net), Packt Publishing, 2014 (400 pages). [Get a 50% discount by pre-ordering now](http://www.packtpub.com/ipython-interactive-computing-and-visualization-cookbook/book) with the code `mK00gPxQM` (time-limited offer)!\n"
+      "> [IPython Cookbook](http://ipython-books.github.io/), by [Cyrille Rossant](http://cyrille.rossant.net), Packt Publishing, 2014 (500 pages)."
      ]
     }
    ],

notebooks/chapter01_basic/06_kernel.ipynb

@@ -359,7 +359,7 @@
      "source": [
       "> You'll find all the explanations, figures, references, and much more in the book (to be released later this summer).\n",
       "\n",
-      "> [IPython Cookbook](http://ipython-books.github.io/), by [Cyrille Rossant](http://cyrille.rossant.net), Packt Publishing, 2014 (400 pages). [Get a 50% discount by pre-ordering now](http://www.packtpub.com/ipython-interactive-computing-and-visualization-cookbook/book) with the code `mK00gPxQM` (time-limited offer)!\n"
+      "> [IPython Cookbook](http://ipython-books.github.io/), by [Cyrille Rossant](http://cyrille.rossant.net), Packt Publishing, 2014 (500 pages)."
      ]
     }
    ],

notebooks/chapter02_best_practices/07_unittests.ipynb

@@ -227,7 +227,7 @@
      "source": [
       "> You'll find all the explanations, figures, references, and much more in the book (to be released later this summer).\n",
       "\n",
-      "> [IPython Cookbook](http://ipython-books.github.io/), by [Cyrille Rossant](http://cyrille.rossant.net), Packt Publishing, 2014 (400 pages). [Get a 50% discount by pre-ordering now](http://www.packtpub.com/ipython-interactive-computing-and-visualization-cookbook/book) with the code `mK00gPxQM` (time-limited offer)!\n"
+      "> [IPython Cookbook](http://ipython-books.github.io/), by [Cyrille Rossant](http://cyrille.rossant.net), Packt Publishing, 2014 (500 pages)."
      ]
     }
    ],

notebooks/chapter02_best_practices/07_unittests_py2.ipynb

@@ -227,7 +227,7 @@
      "source": [
       "> You'll find all the explanations, figures, references, and much more in the book (to be released later this summer).\n",
       "\n",
-      "> [IPython Cookbook](http://ipython-books.github.io/), by [Cyrille Rossant](http://cyrille.rossant.net), Packt Publishing, 2014 (400 pages). [Get a 50% discount by pre-ordering now](http://www.packtpub.com/ipython-interactive-computing-and-visualization-cookbook/book) with the code `mK00gPxQM` (time-limited offer)!\n"
+      "> [IPython Cookbook](http://ipython-books.github.io/), by [Cyrille Rossant](http://cyrille.rossant.net), Packt Publishing, 2014 (500 pages)."
      ]
     }
    ],

notebooks/chapter03_notebook/01_blocks.ipynb

@@ -219,7 +219,7 @@
      "source": [
       "> You'll find all the explanations, figures, references, and much more in the book (to be released later this summer).\n",
       "\n",
-      "> [IPython Cookbook](http://ipython-books.github.io/), by [Cyrille Rossant](http://cyrille.rossant.net), Packt Publishing, 2014 (400 pages). [Get a 50% discount by pre-ordering now](http://www.packtpub.com/ipython-interactive-computing-and-visualization-cookbook/book) with the code `mK00gPxQM` (time-limited offer)!\n"
+      "> [IPython Cookbook](http://ipython-books.github.io/), by [Cyrille Rossant](http://cyrille.rossant.net), Packt Publishing, 2014 (500 pages)."
      ]
     }
    ],

notebooks/chapter03_notebook/02_nbformat.ipynb

@@ -286,7 +286,7 @@
      "source": [
       "> You'll find all the explanations, figures, references, and much more in the book (to be released later this summer).\n",
       "\n",
-      "> [IPython Cookbook](http://ipython-books.github.io/), by [Cyrille Rossant](http://cyrille.rossant.net), Packt Publishing, 2014 (400 pages). [Get a 50% discount by pre-ordering now](http://www.packtpub.com/ipython-interactive-computing-and-visualization-cookbook/book) with the code `mK00gPxQM` (time-limited offer)!\n"
+      "> [IPython Cookbook](http://ipython-books.github.io/), by [Cyrille Rossant](http://cyrille.rossant.net), Packt Publishing, 2014 (500 pages)."
      ]
     }
    ],