Refactored LightSource.shade_rgb into three separate functions
Added support for vertical exag and non-uniform spacing to LightSource
Added new blending modes to LightSource for more realistic rendering
Updated shading example to show new styles and added exmaple DEM from SRTM data
Make the "fraction" kwarg behave as it did before recent LightSource enhancements
Strip whitespace and strict PEP8 compliance
Avoid potential divide by zero in LightSource.hillshade
Fix calculation of aspect for hillshading.
Make clipping work properly for effectively planar surfaces
Added tests for LightSource functionality
Added example of using the custom hillshading on a 3D surface plot
PEP8 fixes
Avoid leaking file descriptors in tests and examples
Added more examples
Fixed hillshading problems with masked elevation arrays
Added array comparison tests for shaded relief
Strict PEP8 compliance for printed arrays
Added *vmin* and *vmax* arguments to LightSource.shade
Added LightSource changes summary to CHANGELOG
Merge pull request #3291 from joferkington/lightsource-enhancements

Lightsource enhancements