Add HttpServer:autoCompress option, to disable auto gzip compression.

pkg/http_multi_server/lib/http_multi_server.dart

Index: pkg/http_multi_server/lib/http_multi_server.dart
diff --git a/pkg/http_multi_server/lib/http_multi_server.dart b/pkg/http_multi_server/lib/http_multi_server.dart
index 7075ab4736f0a80fd8567ad693bc5c09d2b50305..01e3ca89df7d1735ed736171ccb7f26e9db68575 100644
--- a/pkg/http_multi_server/lib/http_multi_server.dart
+++ b/pkg/http_multi_server/lib/http_multi_server.dart
@@ -46,6 +46,13 @@ class HttpMultiServer extends StreamView<HttpRequest> implements HttpServer {
     }
   }
 
+  bool get autoCompress => _servers.first.autoCompress;
+  set autoCompress(bool value) {
+    for (var server in _servers) {
+      server.autoCompress = value;
+    }
+  }
+
   /// Returns the port that one of the wrapped servers is listening on.
   ///
   /// If the wrapped servers are listening on different ports, it's not defined