fix copyright message based on make check

Author: ryantm

src/libstd/cast.rs

@@ -1,6 +1,6 @@
-// Copyright 2012-2013 The Rust Project Developers.
-// See the COPYRIGHT file at the top-level directory of this 
-// distribution and at // http://rust-lang.org/COPYRIGHT.
+// Copyright 2012-2014 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
 //
 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license