Refactored EventLoop::timeout_ms to use Duration instead of u64.
[fix] Slab.contains()
[test] Slab.contains()
Merge remote-tracking branch 'rozaliev/fix_slab_contains'
[fix] import path for FromStr
Reexport enums variants

With https://github.com/rust-lang/rust/pull/18973 merged enum variants are namespaced. They should be reexported or used like Enum::Variant.
Import num::Int
Fix deprecation warnings
Merge fixes for Rust master
Don't check path passed to UnixSocket::bind

Leave it up to user to provide non-existent path for bind and provide
MioErrorKind::AddrInUse wrapper to better handle possible EADDRINUSE
error kind from nix-rust