shrev 0.6.0

Event channel, meant to be used with `specs`.
Documentation 
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A pull based event channel, 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::{EventChannel, EventReadData};

#[derive(Clone, Debug, PartialEq, Eq)]
pub struct TestEvent {
    data: u32,
}

fn main() {
    let mut channel = EventChannel::new();

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

    let mut reader_id = channel.register_reader();

    // Should be empty, because reader was created after the write
    match channel.read(&mut reader_id) {
       Ok(EventReadData::Data(data)) => assert_eq!(
           Vec::<TestEvent>::default(),
           data.cloned().collect::<Vec<_>>()
       ),
       _ => panic!(),
    }

    channel
       .slice_write(&mut [TestEvent { data: 8 }, TestEvent { data: 9 }])
       .expect("");

    // Should have data, as a second write was done
    match channel.lossy_read(&mut reader_id) {
       Ok(data) => assert_eq!(
           vec![TestEvent { data: 8 }, TestEvent { data: 9 }],
           data.cloned().collect::<Vec<_>>()
       ),
       _ => panic!(),
    }
}
```