code: function readTasks(err, data, callback) {
  			this.tasks = JSON.parse(data);
  
  			var sortedTasks = _.sortBy(this.tasks, function(task) { return parseInt(task.id, 10); });
  			largestID = sortedTasks[sortedTasks.length-1].id;
  
  			if(callback) {
  				callback(err, this);
  			}
  		}
docs: Parse the tasks from a string and set the global tasks array
  
  @param err
  @param {String} data
  @param {function} callback
  @return {undefined}