• Added new matplotlib.sankey.Sankey for generating Sankey diagrams.
• In imshow(), setting interpolation to 'nearest' will now always mean that the nearest-neighbor interpolation is performed. If you want the no-op interpolation to be performed, choose 'none'.
• There is now a common set of markers for all plotting functions. Previously, some markers existed only for scatter() or just for plot(). This is now no longer the case. This merge did result in a conflict. The string 'd' now means "thin diamond" while 'D' will mean "regular diamond".