pubnub/objective-c — pull request #58 by hank8903 (2014-04-24 16:26:03+00:00)
Title: Updated documentation for accessPeriodDuration to match implementation.

Implementation defaults a value less than 0 to a default value of 1440.
```objective-c
self.accessPeriodDuration = accessPeriodDuration >= 0 ? accessPeriodDuration : kPNDefaulfAccessPeriodDuration;
```