Added ability to cache the whole graphql response

.gitignore

@@ -10,3 +10,4 @@ target/
 .project
 .settings
 bin
+.DS_Store

graphql-java-servlet/src/main/java/graphql/kickstart/servlet/AbstractGraphQLHttpServlet.java

@@ -87,7 +87,7 @@ public void init() {
  if (configuration.getResponseCacheManager() != null) {
  this.requestHandler = new CachingHttpRequestHandlerImpl(configuration);
  } else {
- this.requestHandler = new HttpRequestHandlerImpl(configuration);
+ this.requestHandler = HttpRequestHandlerFactory.create(configuration);
  }
  }
  }

graphql-java-servlet/src/main/java/graphql/kickstart/servlet/HttpRequestHandlerImpl.java

@@ -47,8 +47,7 @@ public void handle(HttpServletRequest request, HttpServletResponse response) thr
  }
 
  protected void execute(GraphQLInvocationInput invocationInput, HttpServletRequest request,
- HttpServletResponse response) {
- try {
+ HttpServletResponse response) throws IOException {
  GraphQLQueryResult queryResult = invoke(invocationInput, request, response);
 
  QueryResponseWriter queryResponseWriter = createWriter(invocationInput, queryResult);

graphql-java-servlet/src/main/java/graphql/kickstart/servlet/cache/CachingHttpRequestHandlerImpl.java

@@ -25,7 +25,7 @@ public CachingHttpRequestHandlerImpl(GraphQLConfiguration configuration) {
 
  @Override
  protected void execute(GraphQLInvocationInput invocationInput, HttpServletRequest request,
- HttpServletResponse response) {
+ HttpServletResponse response) throws IOException {
  // try to return value from cache if cache exists, otherwise processed the query
  boolean returnedFromCache;