Singleton not enforced like in Chapter 9


:bulb: The singleton status of BNRFeedStore is not enforced like the BNRItemStore from Chapter 9 (see page 193) and the BNRImageStore from Chapter 12. I know this is just a matter of programming style (i.e. I, the programmer, take responsibility for never calling BNRFeedStore alloc or allocWithZone:) but it could probably use a sentence or two to note this.