Minor cleanup to GrizzlyResponse.

Author: rlubke

providers/grizzly/src/main/java/com/ning/http/client/providers/grizzly/GrizzlyResponse.java

@@ -136,10 +136,18 @@ public String getResponseBodyExcerpt(int maxLength) throws IOException {
      */
     public String getResponseBody() throws IOException {
 
-        return getResponseBody(Charsets.DEFAULT_CHARACTER_ENCODING);
+        return getResponseBody(null);
 
     }
 
+    /**
+     * @return the response body as a Grizzly {@link Buffer}.
+     */
+    @SuppressWarnings("UnusedDeclaration")
+    public Buffer getResponseBodyAsBuffer() {
+        return responseBody;
+    }
+
     /**
      * {@inheritDoc}
      */