adapt to mapnik 'image_data_any' branch
update mapnik 3 sdk
pull in correct mapnik-vector-tile branch
whoops
Merge branch 'master' of github.com:mapnik/node-mapnik into image_data_any
catch and throw in map.render
avoid double compile on 'make clean && make debug' dance
Merge branch 'master' of github.com:mapnik/node-mapnik into image_data_any

Conflicts:
	scripts/build_against_sdk.sh
	src/blend.cpp
	src/reader.hpp
use mapnik-vector-tile master
Merge pull request #363 from mapnik/image_data_any

Image data any