EventChain's wait function

eventChain.js

    update.wait = function(secs) {
      var decrement = secs;
      steps.push(function() {
        // Update.
        if (decrement) {
          decrement -= ig.system.tick;
        }
        // End.
        if (decrement <= 0) {
          steps.shift();
          // Necessary because of repeat.
          decrement = secs;
        }
      });
      return this;
    };