Drop landuse=grave_yard

We still render landuse=cemetery and amenity=grave_yard.

See issue gravitystorm#204.

landcover.mss

@@ -102,7 +102,6 @@
   }
 
   [feature = 'landuse_cemetery'],
-  [feature = 'landuse_grave_yard'],
   [feature = 'amenity_grave_yard'] {
     [zoom >= 10][zoom < 14] {
       polygon-fill: @cemetery;

project.mml

@@ -121,7 +121,7 @@
       ],
       "Datasource": {
         "type": "postgis",
-        "table": "(select way, name, religion,\ncoalesce (aeroway, amenity, landuse, leisure, military, \"natural\", power, tourism, highway) as feature from (\nselect way, COALESCE(name,'') AS name, \n('aeroway_' || (case when aeroway in ('apron', 'aerodrome') then aeroway else null end)) as aeroway,\n('amenity_' || (case when amenity in ('parking', 'university', 'college', 'school', 'hospital', 'kindergarten', 'grave_yard') then amenity else null end)) as amenity,\n('landuse_' || (case when landuse in ('quarry', 'vineyard', 'orchard', 'cemetery', 'grave_yard', 'residential', 'garages', 'field', 'meadow', 'grass', 'allotments', 'forest', 'farmyard', 'farm', 'farmland', 'recreation_ground', 'conservation', 'village_green', 'retail', 'industrial', 'railway', 'commercial', 'brownfield', 'landfill', 'construction') then landuse else null end)) as landuse,\n('leisure_' || (case when leisure in ('swimming_pool', 'playground', 'park', 'recreation_ground', 'common', 'garden', 'golf_course', 'picnic_table','sports_centre','stadium','pitch','track') then leisure else null end)) as leisure,\n('military_' || (case when military in ('barracks', 'danger_area') then military else null end)) as military,\n('natural_' || (case when \"natural\" in ('beach','desert','heath','mud','grassland','wood','sand','scrub') then \"natural\" else null end)) as \"natural\",\n('power_' || (case when power in ('station','sub_station','substation','generator') then power else null end)) as power,\n('tourism_' || (case when  tourism in ('attraction', 'camp_site', 'caravan_site', 'picnic_site', 'zoo') then tourism else null end)) as tourism,\n('highway_' || (case when highway in ('services', 'rest_area') then highway else null end)) as highway,\ncase when religion in ('christian','jewish') then religion else 'INT-generic'::text end as religion\n       from planet_osm_polygon\n       where landuse is not null\n          or leisure is not null\n          or aeroway in ('apron','aerodrome')\n          or amenity in ('parking','university','college','school','hospital','kindergarten','grave_yard')\n          or military in ('barracks','danger_area')\n          or \"natural\" in ('beach','desert','heath','mud','grassland','wood','sand','scrub')\n          or power in ('station','sub_station','substation','generator')\n          or tourism in ('attraction','camp_site','caravan_site','picnic_site','zoo')\n          or highway in ('services','rest_area')\n       order by z_order,way_area desc\n      ) as landcover\n) as features",
+        "table": "(select way, name, religion,\ncoalesce (aeroway, amenity, landuse, leisure, military, \"natural\", power, tourism, highway) as feature from (\nselect way, COALESCE(name,'') AS name, \n('aeroway_' || (case when aeroway in ('apron', 'aerodrome') then aeroway else null end)) as aeroway,\n('amenity_' || (case when amenity in ('parking', 'university', 'college', 'school', 'hospital', 'kindergarten', 'grave_yard') then amenity else null end)) as amenity,\n('landuse_' || (case when landuse in ('quarry', 'vineyard', 'orchard', 'cemetery', 'residential', 'garages', 'field', 'meadow', 'grass', 'allotments', 'forest', 'farmyard', 'farm', 'farmland', 'recreation_ground', 'conservation', 'village_green', 'retail', 'industrial', 'railway', 'commercial', 'brownfield', 'landfill', 'construction') then landuse else null end)) as landuse,\n('leisure_' || (case when leisure in ('swimming_pool', 'playground', 'park', 'recreation_ground', 'common', 'garden', 'golf_course', 'picnic_table','sports_centre','stadium','pitch','track') then leisure else null end)) as leisure,\n('military_' || (case when military in ('barracks', 'danger_area') then military else null end)) as military,\n('natural_' || (case when \"natural\" in ('beach','desert','heath','mud','grassland','wood','sand','scrub') then \"natural\" else null end)) as \"natural\",\n('power_' || (case when power in ('station','sub_station','substation','generator') then power else null end)) as power,\n('tourism_' || (case when  tourism in ('attraction', 'camp_site', 'caravan_site', 'picnic_site', 'zoo') then tourism else null end)) as tourism,\n('highway_' || (case when highway in ('services', 'rest_area') then highway else null end)) as highway,\ncase when religion in ('christian','jewish') then religion else 'INT-generic'::text end as religion\n       from planet_osm_polygon\n       where landuse is not null\n          or leisure is not null\n          or aeroway in ('apron','aerodrome')\n          or amenity in ('parking','university','college','school','hospital','kindergarten','grave_yard')\n          or military in ('barracks','danger_area')\n          or \"natural\" in ('beach','desert','heath','mud','grassland','wood','sand','scrub')\n          or power in ('station','sub_station','substation','generator')\n          or tourism in ('attraction','camp_site','caravan_site','picnic_site','zoo')\n          or highway in ('services','rest_area')\n       order by z_order,way_area desc\n      ) as landcover\n) as features",
         "extent": "-20037508,-19929239,20037508,19929239",
         "key_field": "",
         "geometry_field": "",