r2d2-diesel

Provides r2d2 support to allow connection pooling with Diesel.

Example

```rust extern crate r2d2; extern crate r2d2_diesel; extern crate diesel;

use std::thread; use diesel::*; use r2d2_diesel::ConnectionManager;

fn main() { let config = r2d2::Config::default(); let manager = ConnectionManager::new("postgres://localhost"); let pool = r2d2::Pool::new(config, manager).unwrap();

for i in 0..10i32 {
    let pool = pool.clone();
    thread::spawn(move || {
        let conn = pool.get().unwrap();
        // Do exciting stuff with the connection!
    });
}

}