use node-mapnik instead of node-blend
Add appveyor config
fix package.json syntax
add ci badges to readme
use node-mapnik@1.4.9
build against node v0.11.x
node-mapnik@1.4.10
appveyor: only test on v0.11.x
use mapnik.Image.compare for faster and more forgiving image comparison
test updates
Merge pull request #4 from mapbox/node-mapnik-blend

Use node-mapnik for blending