Added a helper method to GenericGeometry called plot_histograms.  This passes the correct arguments to the Plots.distributions method. I think its a good plan to have all the Core objects each have numerous plot_**** methods, so this is a start, since I was working on the Plots methods anyway.
Added a helper method to GenericGeometry called plot_histograms.  This passes the correct arguments to the Plots.distributions method. I think its a good plan to have all the Core objects each have numerous plot_**** methods, so this is a start, since I was working on the Plots methods anyway.

amdouglas/OpenPNM,PMEAL/OpenPNM,TomTranter/OpenPNM,amdouglas/OpenPNM,stadelmanma/OpenPNM