add colorbar_from_cmap_norm module
add colorbar_from_cmap_norm module

- create a colorbar in a specified axis from a colormap instance, a norm
  instance, and an array of values.  This is a workaround for a problem
  I'm having where calling plt.colorbar on different
  matplotlib.contour.QuadContourSet created from the same cmap and norm
  produces different colorbars, all of which are messed up in one way or
  another.  This function creates a dummy mappable and creates the
  colorbar from it.

Timothy-W-Hilton/TimPyUtils