version 0.2.0

Mayor release, mostly introducing the new colorbar functionality.

• add _color_palette that selects colors from the whole range of the colormap. Previously we used the seaborn logic that excludes colors at the edge of the colorbar (closes GH:#1).
• the colorbar functionality was entirely redesigned:
  • new top-level function mpu.colorbar
  • added aspect keyword which defines the ratio of long to short side
  • the default width/ height is now aspect=20 (was size=0.04)
  • pad and size are now scaled by the width/ height of the axes (was width/ height of the figure)
  • pad now uses the matplotlib default (0.05 for vertical bars and 0.15 for horizontal colorbars)
• add _is_monotonic to infer_interval_breaks
• renamed sample_data_3d to sample_data_map