Add the licensing header.

examples/heka-lua-bro/bro_intel.lua

@@ -1,3 +1,13 @@
+-- This Source Code Form is subject to the terms of the Mozilla Public
+-- License, v. 2.0. If a copy of the MPL was not distributed with this
+-- file, You can obtain one at http://mozilla.org/MPL/2.0/.
+-- Copyright (c) 2014 Mozilla Corporation
+--
+-- Contributors:
+-- Anthony Verez averez@mozilla.com
+-- Jeff Bryner jbryner@mozilla.com
+-- Michal Purzynski mpurzynski@mozilla.com
+
 local l=require "lpeg"
 local string=require "string"
 l.locale(l) --add locale entries in the lpeg table