code: function checkPositiveInteger(settings, name, where) {
      var N;
      N = settings[name];
      if (!J.isInt(N, 0)) {
          throw new Error (where + name + ' must be an' +
                           ' integer and larger than 0. Found: ' + N);
      }
  }
docs: ## Helper methods 
  ## checkPositiveInteger
  
  Checks whether a property is a positive integer throwing an error if not
  
  @param {object} settings The object for which to check a property.
  @param {string} name The name of the property to check.
  @param {string} where String to prepend to the error message.
  
  @throws {Error} Thrown if `settings[name]` is not a positive integer
  
  @see WaitingRoom.parseSettings