Added correct Expires and Cache-Control headers in WSGI and CGI responses
Added correct Expires and Cache-Control headers in WSGI and CGI responses

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