Update tests to latest spec in http://www.techempower.com/benchmarks/#section=code

grails/hello/grails-app/controllers/hello/HelloController.groovy

@@ -9,28 +9,44 @@ import java.util.concurrent.ThreadLocalRandom
 class HelloController {
 
     def index() {
-      def msg = [
-        message: "Hello, world"
-      ]
-      render msg as JSON
+        plaintext()
     }
 
+    // benchmark specification
+    // http://www.techempower.com/benchmarks/#section=code
+    
+    // Test type 1: JSON serialization
+    def json() {
+        def msg = [
+            message: "Hello, world"
+        ]
+        render msg as JSON
+    }
+
+    // Test type 2: Single database query
     @Transactional(readOnly=true)
-    def db(int queries) {
-      if(queries < 1) queries=1
-      def worlds = new ArrayList(queries)
-      def random = ThreadLocalRandom.current();
+    def db() {
+        def random = ThreadLocalRandom.current()
+        def world = World.read(random.nextInt(10000) + 1)
+        render world as JSON
+    }
+    
+    // Test type 3: Multiple database queries
+    @Transactional(readOnly=true)
+    def queries(int queries) {
+        if(queries < 1) queries=1
+        if(queries > 500) queries=500
+        def worlds = new ArrayList(queries)
+        def random = ThreadLocalRandom.current()
 
-      for (int i = 0; i < queries; i++) {
-        worlds.add(World.read(random.nextInt(10000) + 1));
-      }
-      render worlds as JSON
+        for (int i = 0; i < queries; i++) {
+            worlds.add(World.read(random.nextInt(10000) + 1))
+        }
+        render worlds as JSON
     }
     
-    def json() {
-      def msg = [
-        message: "Hello, world"
-      ]
-      render msg as JSON
+    // Test type 6: Plaintext
+    def plaintext() {
+        render text:'Hello, world', contentType:'text/plain'
     }
 }