shrev 0.3.1

Event handler, meant to be used with `specs`.
Documentation 
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A pull based event handler, with events stored in a ring buffer,
 meant to be used as a resource in [`specs`](specs).
 
[specs]: https://github.com/slide-rs/specs

Example

```rust
extern crate shrev;

use shrev::EventHandler;

#[derive(Clone, Debug, PartialEq, Eq)]

pub struct TestEvent {
    data: u32,
}

fn main() {
    let mut event_handler = EventHandler::new();

        event_handler
            .write(&mut vec![TestEvent { data: 1 }, TestEvent { data: 2 }])
            .expect("");

        let mut reader_id = event_handler.register_reader();

        // Should be empty, because reader was created after the write
        assert_eq!(
            Vec::<TestEvent>::default(),
            event_handler
                .read(&mut reader_id)
                .unwrap()
                .cloned()
                .collect::<Vec<_>>()
        );

        event_handler
            .write(&mut vec![TestEvent { data: 8 }, TestEvent { data: 9 }])
            .expect("");

        // Should have data, as a second write was done
        assert_eq!(
            vec![TestEvent { data: 8 }, TestEvent { data: 9 }],
            event_handler
                .read(&mut reader_id)
                .unwrap()
                .cloned()
                .collect::<Vec<_>>()
        );
}
```