BUG: info _repr_html doesn't show class name
This is only for the info repr. It's not a problem with `df.info()`.

http://nbviewer.ipython.org/gist/TomAugspurger/4c83a646ffb93d5ee978

From a console attached to the same session:

``` python
In [1]: df
Out[5]: 
<class 'pandas.core.frame.DataFrame'>
Int64Index: 2 entries, 0 to 1
Data columns (total 2 columns):
0    2 non-null float64
1    2 non-null float64
dtypes: float64(2)

```

I think the `<class ... >` is being interpreted as an HTML tag. We'll need to escape it. Our test checks whether `<class>` is _in_ the repr, which it is, it's just not visible.
