Lapin integration with async-std

This crate integrates lapin with async-std by using async-std's executor inside of lapin for its internal operations and for consumer delegates.

``` use async_amqp::*; use lapin::{Connection, ConnectionProperties, Result};

[async_std::main]

async fn main() -> Result<()> { let addr = std::env::var("AMQPADDR").unwraporelse(|| "amqp://127.0.0.1:5672/%2f".into()); let conn = Connection::connect(&addr, ConnectionProperties::default().withasyncstd()).await?; // Note the with_async_std() here let channel = conn.create_channel().await?;

// Rest of your program

} ```