readme update for settings

Author: jmccaull

README.md

@@ -234,8 +234,8 @@ Here's an example of a GraphQL provider that implements three interfaces at the
 
 ## Request-scoped DataLoaders
 
-It is possible to use dataloaders in a request scope by customizing [GraphQLContextBuilder](https://github.com/graphql-java-kickstart/graphql-java-servlet/blob/master/src/main/java/graphql/servlet/GraphQLContextBuilder.java).
-And instantiating a new [DataLoaderRegistry](https://github.com/graphql-java/java-dataloader/blob/master/src/main/java/org/dataloader/DataLoaderRegistry.java) for each GraphQLContext.
+It is possible to use dataloaders in both a request scope and a per query scope by customizing [GraphQLContextBuilder](https://github.com/graphql-java-kickstart/graphql-java-servlet/blob/master/src/main/java/graphql/servlet/context/GraphQLContextBuilder.java) and selecting the appropriate [ContextSetting](https://github.com/graphql-java-kickstart/graphql-java-servlet/blob/master/src/main/java/graphql/servlet/context/ContextSetting.java) with the provided [GraphQLConfiguration](https://github.com/graphql-java-kickstart/graphql-java-servlet/blob/master/src/main/java/graphql/servlet/config/GraphQLConfiguration.java).
+A new [DataLoaderRegistry](https://github.com/graphql-java/java-dataloader/blob/master/src/main/java/org/dataloader/DataLoaderRegistry.java) should be created in each call to the GraphQLContextBuilder, and the servlet will call the builder at the appropriate times.
 For eg:
 ```java
 public class CustomGraphQLContextBuilder implements GraphQLContextBuilder {
@@ -248,26 +248,17 @@ public class CustomGraphQLContextBuilder implements GraphQLContextBuilder {
 
     @Override
     public GraphQLContext build(HttpServletRequest req) {
-        GraphQLContext context = new GraphQLContext(req);
-        context.setDataLoaderRegistry(buildDataLoaderRegistry());
-
-        return context;
+        return new GraphQLContext(buildDataLoaderRegistry());
     }
 
     @Override
     public GraphQLContext build() {
-        GraphQLContext context = new GraphQLContext();
-        context.setDataLoaderRegistry(buildDataLoaderRegistry());
-
-        return context;
+        return new GraphQLContext(buildDataLoaderRegistry());
     }
 
     @Override
     public GraphQLContext build(HandshakeRequest request) {
-        GraphQLContext context = new GraphQLContext(request);
-        context.setDataLoaderRegistry(buildDataLoaderRegistry());
-
-        return context;
+        return new GraphQLContext(buildDataLoaderRegistry());
     }
 
     private DataLoaderRegistry buildDataLoaderRegistry() {
@@ -289,3 +280,4 @@ public class CustomGraphQLContextBuilder implements GraphQLContextBuilder {
      }
 
  ```
+ If per request is selected, this will cause all queries within the http request, if using a batch, to share dataloader caches and batch together load calls as efficently as possible. The dataloaders are dispatched using instrumentation and the correct instrumentation will be selected according to the ContextSetting. The default context setting in GraphQLConfiguration is per query.