build against latest 2.3.x SDK [publish binary]
Add two failing tests for raster compositing in vtiles that need attention
Merge branch 'master' of github.com:mapnik/node-mapnik
accept options for vtile.addGeoJSON
vtile.composite testcase with two non-intersecting layers
avoid vt.parse throwing after compositing empty layer
Start updating changelog for 1.4.6
add GDAL revision used in SDK to changelog
bump to v1.4.6 [publish binary]
adapt test to new no-throw behavior in b6b9b93d30e
merge with master