Re: [directory-upload] easier way to determine if something is a directory? (#24)

I agree that we probably don't need an additional function to tell us if the object is a Directory since we already get that functionality from `instanceof`. I believe that there was some guidance early on that we shouldn't use `instanceof` because of multi-frame DOM concerns which I can't seem to recall now. Perhaps it isn't actually an issue and we can change the example from `filesAndDirs[i].getFilesAndDirectories === 'function'` to `filesAndDirs[i] instanceof Directory`?

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