Licensed under either of

  Apache License, Version 2.0 (http://www.apache.org/licenses/LICENSE-2.0)
  MIT license (http://opensource.org/licenses/MIT)

at your option.

Unless you explicitly state otherwise, any contribution intentionally submitted
for inclusion in this work by you, as defined in the Apache-2.0 license, shall
be dual licensed as above, without any additional terms or conditions.
