added simple variable for S for plural/singular units

Author: itslenny

app/js/timer.js

@@ -96,9 +96,13 @@ angular.module('timer', [])
 
         function calculateTimeUnits() {
           $scope.seconds = Math.floor(($scope.millis / 1000) % 60);
+          $scope.secondsS = $scope.seconds==1 ? '' : 's';
           $scope.minutes = Math.floor((($scope.millis / (60000)) % 60));
+          $scope.minutesS = $scope.minutesS==1 ? '' : 's';
           $scope.hours = Math.floor((($scope.millis / (3600000)) % 24));
+          $scope.hoursS = $scope.hoursS==1 ? '' : 's';
           $scope.days = Math.floor((($scope.millis / (3600000)) / 24));
+          $scope.daysS = $scope.daysS==1 ? '' : 's';
         }
 
         //determine initial values of time units and add AddSeconds functionality