Obtaining options data from yahoo is broken
I am not sure, but it appears that obtaining options data from yahoo is broken as it results into following error at the end.
#### Code Sample, a copy-pastable example if possible

from pandas.io.data import Options
aapl = Options('aapl', 'yahoo')
data = aapl.get_all_data()
#### Expected Output

AAPL options data for near-term expiry dates
#### output of `pd.show_versions()`

pandas: 0.18.1+204.gd7c028d
pandas_datareader: 0.2.1
#### output of self._get_expiry_dates()

pandas/io/data.py in _get_expiry_dates_and_links(self)
   1191
   1192         if len(expiry_dates) == 0:
   1193             raise RemoteDataError('Data not available')
   1194
   1195         expiry_links = dict(zip(expiry_dates, links))

RemoteDataError: Data not available
