code: function(callback) {
  			var t = this;
  
  			if(!t.running && (!t.countdown || t.countdown && t.time.time > 0)) {
  				t.face.start(t.time);
  				t.timer.start(function() {
  					t.flip();
  					
  					if(typeof callback === "function") {
  						callback();
  					}	
  				});
  			}
  			else {
  				t.log('Trying to start timer when countdown already at 0');
  			}
  		}
docs: Starts the clock