fix enum type for geometry comparison
implement vtile.query - refs mapbox/carmen#64 and mapnik/mapnik#2041
variable rename for clarity
add tests for converting shapefile->geojson - refs mapnik/mapnik#1165
Feature.toWKB() and Feature.toWKT()
add getPixel/setPixel on mapnik.Image
vtile.query: break early if hit_test works
vtile.query tolerance default should be 0.0
Restrict test to >= 2.3.x
Merge pull request #197 from mojodna/wellknown

Feature.toWKB() and Feature.toWKT()
add #197 to changelog
featureset.next() is broken with node v0.6.x so skip this test if using old node
vtile.query: accept 'layer' option to restrict results - refs mapbox/carmen#64
pretty print grid test data
update vtile tests
add vtile rendering with markers
fix test name
use latest mapnik-vector-tile with tile_datasource geometry improvements
more tests for vtile.query
use internal hit_test algorithm for now