Stubs next version
Comes back to use mapnik 2.3.x based on cartodb/node-mapnik@1.4.15-cdb from windshaft@0.28.0
Release 1.18.0
Merge tag '1.18.0' into cdb

2014-10-03

Announcements:
 - Comes back to use mapnik 2.3.x based on cartodb/node-mapnik@1.4.15-cdb from windshaft@0.28.0