def common_sense_ratio(returns):
return ep.tail_ratio(returns) *(<NUM_LIT:1> + ep.annual_return(returns))<EOL>
Common sense ratio is the multiplication of the tail ratio and the
Gain-to-Pain-Ratio -- sum(profits) / sum(losses).

See http://bit.ly/1ORzGBk for more information on motivation of
this metric.


Parameters
----------
returns : pd.Series
    Daily returns of the strategy, noncumulative.
     - See full explanation in tears.create_full_tear_sheet.

Returns
-------
float
    common sense ratio