This change is done for two reasons:
- First, the Rust port is, as of the time of writing in an awkward
position because he is dual license under MIT/APACHE instead of only
the APACHE license. This change in license should fix this problem.
- Second, and the most convincing reason is that there have been
some discussion with the Rust Libs Team to integrate the Rust port
directly into the Rust standard library.
The license change is required because the code for every the Rust
repository need's to dual license against MIT/APACHE.
