core-net

This is a rip of core::net from the Rust language, with stability features removed so you can use the unstable features on the stable compiler.

It was ripped frop this commit 38b96553112dce3de630890701f17d86e265f6ba and may not be up to date.

In order to use these features, you probably will have to std::mem::transmute the types from the actual core library into these types and back. Have fun.