[line-directive] Add code header

Add code headers missing from `utils/line-directive`, as per the template
from #762.

Author: modocache

utils/line-directive

@@ -1,5 +1,21 @@
 #!/usr/bin/env python
-#convert line numbers in error messages according to "line directive" comments
+# line-directive.py - Transform line numbers in error messages -*- python -*-
+#
+# This source file is part of the Swift.org open source project
+#
+# Copyright (c) 2014 - 2015 Apple Inc. and the Swift project authors
+# Licensed under Apache License v2.0 with Runtime Library Exception
+#
+# See http://swift.org/LICENSE.txt for license information
+# See http://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+#
+# ----------------------------------------------------------------------------
+#
+# Converts line numbers in error messages according to "line directive"
+# comments.
+#
+# ----------------------------------------------------------------------------
+
 import sys
 import re
 import bisect