Individual timers

[ljungmark]

Today, you can set two different timer lengths for soft- and hard-boiled eggs. But once you start the timer, both timers tick.

Timer starts in Eggup.prototype.start, which creates a new instance of Countdown;

function Countdown(duration, granularity) {
  this.duration = duration;
  this.granularity = granularity || 1000; /** Defines the tick frequency */
  this.functions = [];
}

Create a way to start the timers individually.