Documentation for Styling has broken links
I hope this is the right way to report this! It is an issue with the documentation rather than the code


#### Problem description

[http://pandas.pydata.org/pandas-docs/stable/style.html#Styling](http://pandas.pydata.org/pandas-docs/stable/style.html#Styling)

This is the first section, and contains a link to:
[http://nbviewer.jupyter.org/github/pandas-dev/pandas/blob/master/doc/source/html-styling.ipynb](http://nbviewer.jupyter.org/github/pandas-dev/pandas/blob/master/doc/source/html-styling.ipynb)

which gives me a 404 error.

Further down:
[http://pandas.pydata.org/pandas-docs/stable/style.html#Builtin-Styles](http://pandas.pydata.org/pandas-docs/stable/style.html#Builtin-Styles) 

As you can see, there is problem in the jupyter notebook where seaborn is not found. At least I assume you will see it - this is what I see:

![image](https://cloud.githubusercontent.com/assets/12841760/25799086/9aced5f0-33db-11e7-90f8-44336d996a5b.png)

error text
```
/Users/taugspurger/miniconda3/envs/pandas-dev/lib/python3.6/site-packages/matplotlib/colors.py:494: RuntimeWarning: invalid value encountered in less
  cbook._putmask(xa, xa < 0.0, -1)
```

