text: //
  //  BLKeyValueObserverBlock.h
  //  BowerLabsFoundation
  //
  //  Created by Jeremy Bower on 2013-01-24.
  //  Copyright (c) 2013 Bower Labs Inc. All rights reserved.
  //
  
  typedef void(^BLKeyValueObserverBlock)(__weak id weakSelf, id oldValue, id newValue);
  typedef void(^BLKeyValueStartupBlock)(__weak id weakSelf, id ref);
  