Bug in resample with multi-index columns?
Hi folks,

It appears that in Pandas 0.14.0, resampling on data frames with multi-index columns erases the multi-index names.  You can see an example of this at http://stackoverflow.com/questions/24442832/how-to-resample-a-pandas-multi-index-data-frame-via-methods-depending-on-the-col/24443544?noredirect=1#comment38000583_24443544.
