wait4 0.1.0

High level wait4 abstraction
Documentation 
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# Rust idiomatic binding to wait4

```
use std::process::Command;
use wait4::Wait4;

let cmd = Command::new(command);

// ...
let mut child = cmd.spawn().unwrap();

let r = child.wait4().unwrap();
```

## Status

- [x] Unix-like using `libc::wait4`
- [ ] Windows using `winapi::um::processthreadsapi::GetProcessTimes` and `winapi::um::psapi::GetProcessMemoryInfo`.