BUG: Escape `<` and `>` in info _repr_html_
Closes https://github.com/pydata/pandas/issues/7105

Before: http://nbviewer.ipython.org/gist/TomAugspurger/4c83a646ffb93d5ee978
After: http://nbviewer.ipython.org/gist/TomAugspurger/81bf15086864ca090bb6

After conosle:

```
In [28]: 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)
```

FYI, I don't know HTML, but I think this is mostly right.

rebase on master and you can merge this in when you are ready, I put up the display changes section: https://github.com/pydata/pandas/commit/8a8ead63b15f36efb5fda6e202b158360b21fee2
 Perf change vs. master

![formating](https://cloud.githubusercontent.com/assets/1312546/2959404/7d6aa6a4-dab2-11e3-81ed-fcc09fda12d9.png)

Doesn't look like much. The x axis is the size of an NxN DataFrame of floats in log base 2.
 @jreback done. Will just wait on Travis.
 Merged via 2bb2a8d52b2e37
