Remove no-longer-necessary KnownFail for python 3.2.
Add ability to use libpng-config to get linker flags
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
copy FontProperty objects to solve bug #3327
test for issue #3327
Added legend.framealpha to rcParams, as alluded to by axes.legend docstring
Added legend.framealpha line to template rcparam file
whats_new statement added