Moved coordinate listing in seed script to a generator function that won't be quite so hard on memory
Moved coordinate listing in seed script to a generator function that won't be quite so hard on memory

jbants/TileStache,SEL-Columbia/TileStache,robpvn/Vector-Tile-Research,jbants/TileStache,moskvax/TileStache,mapzen/TileStache,mpuig/TileStache,mapzen/TileStache,moskvax/TileStache,SEL-Columbia/TileStache,Billups/TileStache,Billups/TileStache,Blechhirn/TileStache,moskvax/TileStache,MetGIS/TileStache,mapzen/TileStache,mpuig/TileStache,Kosta-Github/TileStache,TileStache/TileStache,robpvn/Vector-Tile-Research,MetGIS/TileStache,mojodna/TileStache,Blechhirn/TileStache,TileStache/TileStache,SEL-Columbia/TileStache,Blechhirn/TileStache,Kosta-Github/TileStache,Billups/TileStache,Kosta-Github/TileStache,mojodna/TileStache,robpvn/Vector-Tile-Research,MetGIS/TileStache,TileStache/TileStache,jbants/TileStache