Threads, tasks, and the Objective-C SDK

No worries! Hopefully it will be of some help. I would just make sure that you weigh whether it's important to track the response `DBTask` objects that you receive back, so that if you're downloading a lot of files from a folder, you have a way of canceling them all at once (if you feel like that's important).

As far as the lock around the boolean, I did that to make sure that the following were one atomic transaction: 1. check if should continue 2. create a download request 3. store the download task object for later use (to cancel). Otherwise, if the cancel function was called, a request might be made but not stored in the task data structure, and therefore would not be cancelled when iterated through. Does that make sense? Probably could have used an `NSOperationQueue` rather than a lock.

Let me know if you run into any issues down the road. And please, if you have any additional feedback for the SDK, do let me know!