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fix 'Index' object has no attribute 'get_values' bug #396

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When invoke the function alphalens.tears.create_turnover_tear_sheetalphalens.tears.create_turnover_tear_sheet() without allocating the param turnover_period, may cause the AttributeError: 'Index' object has no attribute 'get_values'.It is because the utils.get_forward_returns_columns() returns columns as an object of Index instead of pd.Series.Hence, Index object hasn't have function get_values().

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