Bring back .groups attribute for GroupBy

[wesm]

A bit more complicated now with possible multiple groupings, however.

[wesm]

@reckoner this will be of interest per your comment on the recent blog article

[reckoner]

Great! I hope you will make the August release date. I'm looking forward
to it.

Thanks!

On 8/19/2011 1:11 PM, wesm wrote:

@reckoner this will be of interest per your comment on the recent blog article

[wesm]

if not by end of this month then definitely in the first week or two of september. I've been hard at work!