Roll Observatory packages and add a roll script

packages/matcher/.status

Index: packages/matcher/.status
diff --git a/packages/matcher/.status b/packages/matcher/.status
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index 0000000000000000000000000000000000000000..ddb02ed7d408db21898689072e3a4e0b7b651a1d
--- /dev/null
+++ b/packages/matcher/.status
@@ -0,0 +1,18 @@
+# Copyright (c) 2014, 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.
+
+# Skip non-test files ending with "_test".
+packages/*: Skip
+*/packages/*: Skip
+*/*/packages/*: Skip
+*/*/*/packages/*: Skip
+*/*/*/*packages/*: Skip
+*/*/*/*/*packages/*: Skip
+
+# Only run tests from the build directory, since we don't care about the
+# difference between transformed an untransformed code.
+test/*: Skip
+
+[ $browser ]
+*: RuntimeError # new unittest package does not support browser tests