Unstructured2D canvas example.
Takes unstructured 2D locations, with corresponding 1 or 2 dimensional
scalar "values". Plots the values looked up from colormaps and
interpolated between the locations.
Clean up:
Edited the header and module docstring.
Removed unused timer and keypress events.
Changed the example data to better showcase what it does.
Modified to satisfy make flake.
autopep8
Corrected the header
Merge pull request #203 from per42/feature/unstructured_2d

Unstructured2D canvas example.