Altered ivars being accessed directly in init.

This is in response to Dave Delong's [issue](https://github.com/NYTimes/objective-c-style-guide/issues/6).

See [here](https://developer.apple.com/library/mac/documentation/Cocoa/Conceptual/MemoryMgmt/Articles/mmPractical.html#//apple_ref/doc/uid/TP40004447-SW6) for definitive proof.