Pass figsize into _grouped_plot -- please review
To still allow default matplotlib size for the figure I added handling of figsize="default"... may be altogether it should just drop custom default size here?

also another commit on **kwds -- depends on what was intended, but at least figsize should be passed 

Thanks. I also pulled in the pyplot.subplots function to improve compatibility with earlier versions of matplotlib.

you'll want to reset to upstream/master (since you did pull request from master) but since you're a git guru you probably already know that ;) 
 THANKS!  yeah -- I hope to figure my ways around -- thanks for the note ;)
 I think you have missed to adopt 837854554bbb4b3076b13860cc7335ca0cd60f5d  which took care about passing figsize from DataFrame.boxplot into plots.boxplot (actually it just was to pass whole **kwd)
 Oops. Thanks
