I am running into problems where histograms are not autoscaling correctly.

I have filed a bug report on github:

https://github.com/matplotlib/matplotlib/issues/841

Below is a copy of the github bug report:

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I am running into problems where histograms are not autoscaling correctly.

Below is a very simple example which reproduces this problem:

```
import pylab as P
P.hist([3000,3010, 3012], histtype='step')
P.savefig('test.pdf')
```

When I run this example using matplotlib v1.1.0 or using the absolute

latest version of matplotlib, I obtain an axes which varies from

3000<x<3012 and 0<y<3000 with no visible histogram.

When I add (before saving the plot) the line:

```
P.gca().set_ylim(ymax=2.1)
```

I get a reasonable axes range and can see the histogram.

I also get a reasonable axes range when I remove the command

histtype='step' or when I use matplotlib v1.0.0.

Thanks for your help,

Joshua