$timeout.coffee

app.factory('timeout', ['$timeout', 
  function($timeout){
    return function $timeoutFactory(){
      var promise = null;
      function timeout (fn, delay, invokeApply){
        $timeout.cancel(promise);
        promise = $timeout(function(){ 
          fn(); 
          promise= null;
        }, delay, invokeApply);
      }
      timeout.cancel = function(){
        $timeout.cancel(promise);
        promise = null;
      };
      return timeout;
    };
}]);

http://plnkr.co/edit/pnVPzDM7BboMltAkIADx?p=info