Launch Leg independently of Frog.

dart/frog/leg/colors.dart

Index: dart/frog/leg/colors.dart
diff --git a/dart/frog/leg/colors.dart b/dart/frog/leg/colors.dart
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+// Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+#library('colors');
+
+final String GREEN_COLOR = '\u001b[32m';
+final String RED_COLOR = '\u001b[31m';
+final String MAGENTA_COLOR = '\u001b[35m';
+final String NO_COLOR = '\u001b[0m';
+
+String green(String string) => "${GREEN_COLOR}$string${NO_COLOR}";
+String red(String string) => "${RED_COLOR}$string${NO_COLOR}";
+String magenta(String string) => "${MAGENTA_COLOR}$string${NO_COLOR}";