piemonte/PBJVision — pull request #190 by bcherry (2014-09-23 18:35:02+00:00)
Title: Remove observer on _captureOutputPhoto during dealloc

I got a bug report that looks like the missing removal here leads to a possible exception during camera destruction. Here's what I saw:

An instance 0x17003b5e0 of class AVCaptureStillImageOutput was deallocated while key value observers were still registered with it. Current observation info: ( Context: 0x100412bd0, Property: 0x1702503e0>