misc/dashboard/codereview: add copyright notices to Go files

R=golang-dev, dsymonds
CC=golang-dev
https://golang.org/cl/6177043

misc/dashboard/codereview/dashboard/cl.go

+// Copyright 2012 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
 package dashboard
 
 // This file handles operations on the CL entity kind.

misc/dashboard/codereview/dashboard/front.go

+// Copyright 2012 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
 package dashboard
 
 // This file handles the front page.

misc/dashboard/codereview/dashboard/gc.go

+// Copyright 2012 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
 package dashboard
 
 // This file handles garbage collection of old CLs.

misc/dashboard/codereview/dashboard/mail.go

+// Copyright 2012 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
 package dashboard
 
 // This file handles receiving mail.

misc/dashboard/codereview/dashboard/people.go

+// Copyright 2012 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
 package dashboard
 
 // This file handles identities of people.