BUG: DataFrame.to_html(index=False) with named Index rendered incorrectly
As below capture, index name is drawn even if `index=False` is specified, and it corrupts the layout.

![2015-06-13 11 47 56](https://cloud.githubusercontent.com/assets/1696302/8142720/1be7dc10-11c2-11e5-894b-8b27c2c62048.png)

For copy/paste to Jupyter:

```
import numpy as np
import pandas as pd
from IPython.display import HTML

df = pd.DataFrame(np.random.randn(2, 2), index=pd.Index(['A', 'B'], name='idx'))
HTML(df.to_html())

HTML(df.to_html(index=False))
```
