Saves the figure to the gallery directory

def savefig(viz, name, gallery=GALLERY):
    """
    Saves the figure to the gallery directory
    """
    if not path.exists(gallery):
        os.makedirs(gallery)

    # Must save as png
    if len(name.split(".")) > 1:
        raise ValueError("name should not specify extension")

    outpath = path.join(gallery, name+".png")
    viz.poof(outpath=outpath)
    print("created {}".format(outpath))