Deprecate data.py

[davidastephens]

Given the subpackage structure implemented by #69, data.py is really just the api, could move this to the top level so you could import directly from pandas-datareader.

ie:

instead of:

from pandas_datareader import data 
data.Options('aapl','yahoo')

import pandas_datareader as pdr
pdr.Options('aapl','yahoo')

[femtotrader]

I won't deprecate for now but I would add right now to __init__.py this

from pandas_datareader.data import Options
from pandas_datareader.data import DataReader

so we will be able to do

import pandas_datareader as pdr
pdr.Options('aapl', 'yahoo')

but also

import pandas_datareader as pdr
pdr.DataReader('aapl', 'yahoo')

but with WorldBank we will still need

from pandas_datareader import wb

Kind regards

[bashtage]

No real point in breaking tons of existing examples.