WorldBank-Transport/open-transit-indicators — pull request #411 by notthatbreezy (2014-11-04 15:34:56+00:00)
Title: Use GeoTrellis' unioned method

GeoTrellis now has a union method; the import
for CascadedPolygonUnion in GeoTrellis broke
this set of code since the imports conflicted.

See: https://github.com/geotrellis/geotrellis/pull/906

This commit fixes that and uses the new unioned
method in GeoTrellis.