DataFrame column name conflict yields empty DataFrame in version 0.13.1
import pandas as pd
s = pd.Series([1,2,3],name='seriesName')
df = pd.DataFrame(s,columns=['columnName'])

In v 0.12, df is the expected DataFrame w/ values [1,2,3] and df.columns = ['columnName']

In v 0.13.1, df is an empty DataFrame.

This seems to be an error, unless there's a reason for the change.
