Timer struct for running very simple, and imprecise measuring of operations

Timer.md

#Timer

struct Timer : Printable {
    let start = NSDate()
    let name: String
    var description: String {
        let now = NSDate()
        let dif = now.timeIntervalSince1970 - start.timeIntervalSince1970
        let roundedDif =  Double(round(1000 * dif)/1000)
        return "\(name) : \(roundedDif)"
    }
}

#Usage

let timer = Timer(name: "Some Thing I'm Timing")

// Do stuff I'm curious about.

println(timer)