Allow raster bands in Collection's item assets

Author: kylebarron

json-schema/schema.json

@@ -47,6 +47,12 @@
               "additionalProperties": {
                 "$ref": "#/definitions/assetfields"
               }
+            },
+            "item_assets": {
+              "type": "object",
+              "additionalProperties": {
+                "$ref": "#/definitions/assetfields"
+              }
             }
           }
         }
@@ -213,4 +219,4 @@
       }
     }
   }
-}
+}