Does not compile with rustc 1.7.0 about rust-msgpack

[zwn]

According to https://travis-ci.org/mneumann/rust-msgpack#L135 the #![feature(slice_splits)] is not needed as it is stable. The log shows it has been built with rust 1.8 but that did not work for me either. Further investigation shows it is due to BurntSushi/byteorder@e429dfb

Rust 1.6 stabilized `read_exact`, which gives us the same functionality without
having to wrap `std::io::Error`. Removing the custom error type makes this
a breaking change, and users will have to replace uses of `byteorder::Error`
with `std::io::Error`.

[Palpatineli]

same failure with rustc 1.10.0 on debian testing x64 as of 2016-08-05

[kallisti5]

same failure with rustc 1.11.0 on Fedora 25. There is a pull request open to fix this one... anyone going to review / accept?