TBR: playground: devtools: Fix up remaining open-sourcing issues.

Also, add c header and source support to jiri-copyright.

MultiPart: 4/5

Change-Id: I05693d1bb322583495947e4519536d0e351230c7
diff --git a/client/bin/compile-css b/client/bin/compile-css
index 249f812..a306d03 100755
--- a/client/bin/compile-css
+++ b/client/bin/compile-css
@@ -1,4 +1,8 @@
 #!/usr/bin/env node
+// Copyright 2015 The Vanadium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
 var minimist = require('minimist');
 var assert = require('assert');
 var myth = require('myth');