Break out ref and copyright to own responses (#79)

src/schema.graphql

@@ -103,6 +103,8 @@ type ProductsSearchResult {
   keywords: [Keyword]
   categories: [Category]
   designers: [Designer]
+  copyrights: [Copyright]
+  references: [Product]
 }
 
 input InteriorsFilterInput {
@@ -277,6 +279,11 @@ type Batch {
   products: [Product]
 }
 
+type Copyright {
+  name: String!
+  products: [Product]
+}
+
 type Product {
   id: ID!
   stockid: Int