Include mapnik/image_compositing.hpp for the composite function
Merge pull request #44 from tomhughes/compositing

Include mapnik/image_compositing.hpp for the composite function
fix handling of filter_factor which is new in mapnik::raster in 3.x
fix compile
bump to v0.5.1
clear out test-cfg.h in make clean
set MAPNIK_PLUGINDIR as command line define rather than in generated header
Remove test header.
remove python examples which now live at https://github.com/mapbox/vector-tile-py
Merge branch 'master' of github.com:mapbox/mapnik-vector-tile
remove python mention from readme
skip zero size rasters
See also URL updates

Some project locations have changed.
Merge pull request #49 from pnorman/patch-1

See also URL updates
clip rasters before transforming back into mapnik features
support latest mapnik 3.x (with custom variant)
travis: test only with Mapnik 3.x
v0.5.2
update changelog for v0.5.2
revert unintended change