timer 0.2.0

A simple timer. Use it to schedule execution of closures after a delay or at a given timestamp.
Documentation
# Timer

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Simple implementation of a Timer in and for Rust.

# Example
```rust
extern crate timer;
extern crate chrono;
use std::sync::mpsc::channel;

let timer = timer::Timer::new();
let (tx, rx) = channel();

timer.schedule_with_delay(chrono::Duration::seconds(3), move || {
  tx.send(()).unwrap();
});

rx.recv().unwrap();
println!("This code has been executed after 3 seconds");
```