Add option container to building field (#1524)

Author: tordans

data/fields/building.json

@@ -63,7 +63,8 @@
             "train_station": "Train Station Building",
             "transportation": "Transportation Building",
             "university": "University Building",
-            "warehouse": "Warehouse"
+            "warehouse": "Warehouse",
+            "container": "Container"
         }
     },
     "terms": [