cocos2d/cocos2d-x — pull request #3285 by gkosciolek (2013-07-26 20:21:20+00:00)
Title: Fix for #2892.

1. Updatet the API documentation and parameter name from "object" to "sender" to reflect it's true purpose.
2. Fixed addObserver and observerExisted because it didn't allowed to add observers to notifications that only differs by sender