Added coverage to use of strictly simple in vector tile compositing.
Added coverage to use of strictly simple in vector tile compositing.

CartoDB/node-mapnik,tomhughes/node-mapnik,tomhughes/node-mapnik,mapnik/node-mapnik,langateam/node-mapnik,mapnik/node-mapnik,tomhughes/node-mapnik,langateam/node-mapnik,CartoDB/node-mapnik,mapnik/node-mapnik,tomhughes/node-mapnik,CartoDB/node-mapnik,tomhughes/node-mapnik,CartoDB/node-mapnik,CartoDB/node-mapnik,langateam/node-mapnik,mapnik/node-mapnik,langateam/node-mapnik,mapnik/node-mapnik,langateam/node-mapnik