ipython/ipython — pull request #2729 by Carreau (2012-12-29 23:08:00+00:00)
Title: Fix Read the doc build, Again

Nothing fancy, only touch Read The Doc auto build.

Just for the principle I'll let that open a few hours before merging.
and just for the sake of you not opening your browser to see the diff :

```diff
if ON_RTD:
# Remove extensions not currently supported on RTD
extensions.remove('matplotlib.sphinxext.only_directives')
+ extensions.remove('matplotlib.sphinxext.mathmpl')
+ extensions.remove('matplotlib.sphinxext.plot_directive')
extensions.remove('ipython_directive')
```