moved matrix class from utils to samples

utils/matrix/matrix_server.dartlib

Index: utils/matrix/matrix_server.dartlib
diff --git a/utils/matrix/matrix_server.dartlib b/utils/matrix/matrix_server.dartlib
deleted file mode 100644
index 58a015721bbeb7b677063d1e7396c34d01e916e2..0000000000000000000000000000000000000000
--- a/utils/matrix/matrix_server.dartlib
+++ /dev/null
@@ -1,11 +0,0 @@
-// Copyright (c) 2011, 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 definition file for the matrix library for non-browser applications.
- * (This gets Float32Array from float32.dart, rather than #import'ing dart:dom.)
- */
-#library("matrix");
-#source("matrix4.dart");
-#source("float32.dart");