kind='area' plot not showing
Maybe it is a bug, but following problem: In the new Pandas 0.14 you guys implemented an awesome kind='area' option for plot. If I plot a dataframe normally, like

`df.plot()`

![](http://i.stack.imgur.com/4voj8.png)

but when I take the option

`df.plot(kind='area')`, I just get

``` Out[69]:
<matplotlib.axes.AxesSubplot at 0x122794550>
<matplotlib.figure.Figure at 0x121b69e10>
```

in my IPython notebook. I used the `%pylab inline` function, so I don't know, why it is not showing. Any suggestions?
