add missing 'invert-rgb' compositing mode
strip newlines and whitespace in XML comparison test
add test comment in relation to https://github.com/mapnik/mapnik/commit/ecc5acbdb953e172fcc652b55ed19b8b581e2146
fix conditional support for webp/jpeg/png in blending - closes #283
update mapnik SDK for both 2.3.x and 3.x
fix queryMany by adding requested fields to mapnik::query baton
Merge branch 'master' of github.com:mapnik/node-mapnik into queryMany-batch