Pandas display.date option not working
pandas: 0.17.0
python: 3.5.0.final.0

```
import pandas as pd

list1 = {"Date":["01/11/15"]} #1st November 2015
pd.set_option('display.date_dayfirst', True)
#pd.set_option('display.date_yearfirst', False)
df = pd.DataFrame(list1, columns=['Date'])
df['Date'] = pd.to_datetime(df['Date'], dayfirst = [True])
df1 = df.sort_values(['Date'], ascending=[True])

print(df1)
```

Prints: 

```
        Date
0 2015-11-01
```

Setting both options to `True` and `False` doesn't work nor does only setting one. Printing df and df1 have the same result. And not specifying a `dayfirst` argument in `pd.to_datetime` doesn't change anything.
