Fix rgba handling, fixes #246
Merge branch 'master' of github.com:mapbox/carto
updated raster colorizer support
Update to use v0.2.x of xml2js
Merge pull request #250 from tomhughes/master

Update xml2js dependency
add raster colorizer (https://github.com/mapnik/mapnik/wiki/RasterColorizer) support to master - closes #5 - refs mapbox/tilemill#761 - depends on https://github.com/mapnik/mapnik/commit/41772edbd7be0d8b2aca774bb9f2f17b1e9d7cd1
Fix fadeout
Allow layers to be rendered without datasources.
Merge branch 'upstream-master' into master
read ppi value from mml