add TypePolicy to Fact (#1138)

closes #995

enables apollo cache to work for 'stacked' 'spent' in /statistics page.

lib/apollo.js

@@ -52,6 +52,9 @@ function getClient (uri) {
             }
           }
         },
+        Fact: {
+          keyFields: ['id', 'type']
+        },
         Query: {
           fields: {
             sub: {