Version 0.19.3

Features

• Layers that use webgl renderers automatically share contexts when possible. Layers can switch renderers manually as well. This largely avoids the limitation of number of webgl contexts in a browser (#975)
• Support affine transforms in the proj4 string (#986)

Improvements

• Speed up rendering geojson features by using constant values for constant geojson styles (#987)

Changes

• The point clustering radius value is now in display pixels (#983)

Bug Fixes

• Fixed drawing partial fixed-scale canvas quads (#985)