Upgrade tilelive-mapnik to 0.6.18-cdb3 and  tilelive-bridge to 2.3.1-cdb4
Upgrade tilelive-mapnik to 0.6.18-cdb3 and  tilelive-bridge to 2.3.1-cdb4

CartoDB/Windshaft,CartoDB/Windshaft,CartoDB/Windshaft