`sphinxext/ipython_directive.py` no longer in matplotlib

Dieses Issue hat noch niemand übernommen.

First of all: thanks for making this great tutorial!

It doesn't work with matplotlib HEAD though, because `matplotlib/sphinxext/ipython_directive.py` no longer exists.
This worked for me:
`cp ipython/docs/sphinxext/ipython_directive.py sampledoc/sphinxext`

After that a missing `import numpy as np` in combination with `@doctest` on line 120 in sampledoc/ipython_directive.rst makes sphinx abort.
For me simply adding the missing `import numpy as np` doesn't work, the doctest still fails.
Is it possible to make the following error message point to the .rst file name and line number that contains `np.random.rand(10,2)` (instead of suggesting a bug in sphinx)?

``` text
$ make html
sphinx-build -b html -d _build/doctrees . _build/html
Running Sphinx v1.0.7
/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/matplotlib/__init__.py:908: UserWarning: This call to matplotlib.use() has no effect
because the the backend has already been chosen;
matplotlib.use() must be called *before* pylab, matplotlib.pyplot,
or matplotlib.backends is imported for the first time.

if warn: warnings.warn(_use_error_msg)
loading pickled environment... not yet created
building [html]: targets for 7 source files that are out of date
updating environment: 7 added, 0 changed, 0 removed
reading sources... [100%] ipython_directive
Exception occurred:
File "/Users/deil/github/sampledoc/sphinxext/ipython_directive.py", line 376, in process_output
raise RuntimeError(e)
RuntimeError: output prompt="Out[13]:" does not match out line=---------------------------------------------------------------------------
NameError Traceback (most recent call last)
/Users/deil/github/sampledoc/ in ()
----> 1 np.random.rand(10,2)

NameError: name 'np' is not defined
The full traceback has been saved in /var/folders/9v/3cf9p8mx0n1gzcsq3mw9799m0000gn/T/sphinx-err-rTVMpU.log, if you want to report the issue to the developers.
Please also report this if it was a user error, so that a better error message can be provided next time.
Either send bugs to the mailing list at ,
or report them in the tracker at . Thanks!
make: *** [html] Error 1
```

There's a few more small issues:
- Line 101 in sampledoc/ipython_directive.rst needs to be indented
Users/deil/github/sampledoc/custom_look.rst:6: (WARNING/2) Duplicate explicit target name: "sphinx".
/Users/deil/github/sampledoc/cheatsheet.rst:7: WARNING: undefined label: cheatsheet -literal (if the link has no caption the label must precede a section header)
/Users/deil/github/sampledoc/extensions.rst:53: WARNING: undefined label: extensions-literal (if the link has no caption the label must precede a section header)

Führe zunächst `make html` aus und überprüfe `sampledoc/sphinxext/ipython_directive.py` und `sampledoc/ipython_directive.rst`. Sieh dir anschließend die anderen in den Warnungen genannten Dateien an: `custom_look.rst`, `cheatsheet.rst` und `extensions.rst`. Als erledigt gilt die Aufgabe, wenn die Direktive mit der aktuellen Version von matplotlib funktioniert, die gemeldete Quellposition hilfreich ist, die Einrückungs- und Referenzprobleme behoben sind und der Dokumentations-Build ohne diese Fehler oder Warnungen abgeschlossen wird.

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