SVGKit/SVGKit — pull request #55 by tsaizhenling (2013-02-21 06:48:18+00:00)
Title: keyvalueobserver bug fix. refer to  issue 42

it is possible to initialize SVGKFastImageView with a null SVGKImage.
when another instance of SVGKImage is assigned. it is not added as observer, but is removed as observer when SVGKFastImageView is deallocated.