added shoes field and additional terms in shoe store preset (#669)

data/presets/shop/shoes.json

@@ -4,6 +4,11 @@
         "point",
         "area"
     ],
+    "fields": [
+        "name",
+        "shoes",
+        "{shop}"
+    ],
     "tags": {
         "shop": "shoes"
     },
@@ -14,7 +19,10 @@
         "heels",
         "loafers",
         "oxfords",
-        "sneakers"
+        "sneakers",
+        "footwear",
+        "sandals",
+        "slippers"
     ],
     "name": "Shoe Store"
 }