title: Map Series to DataFrame while disregarding year
body: <p>I have a DataFrame and a Series, the DataFrame has data from 1983 to 2016 and the Series has only 1 year of data (and the year doesn't matter). I want to add a new column to the DataFrame with the data from the Series, except (since I have only 1 year in the Series) I would like to ignore the year of the Series. So, Jan 1st 00:00 in the series should map to Jan 1st 00:00 for all 34 years in the DataFrame. Does anyone know a nice Panda way to do this without using <code>.apply</code>?</p>