DOC: DataFrame.resample docs could be improved
http://pandas.pydata.org/pandas-docs/stable/generated/pandas.DataFrame.resample.html?highlight=dataframe%20resample#pandas.DataFrame.resample

These are the *same* docs for both Series & DataFrame. so might be nice to add some DataFrame examples (and use on / axis parameters). So may need to move these to a ``shared_docs`` template to suppport this.