Swift-friendly dispatch_after()

DispatchAfter.swift

/**
Shadows the system’s `dispatch_after()` function with a friendlier syntax for Swift.
Performs the `block` on `queue` after `delay` seconds.

:param: delay The delay (in seconds). Defaults to 0.1 seconds.
:param: queue The dispatch queue to perform the work on. Defaults to the main queue.
:param: block The block to execute after the delay.
*/
public func dispatch_after(delayInSeconds delay: NSTimeInterval = 0.1,
    queue: dispatch_queue_t = dispatch_get_main_queue(),
    block: dispatch_block_t) {
        let time = dispatch_time(DISPATCH_TIME_NOW,
            Int64(NSTimeInterval(NSEC_PER_SEC) * delay))
        
        dispatch_after(time, queue, block)
}