AFNetworking/AFNetworking — pull request #321 by tomwans (2012-04-27 18:47:28+00:00)
Title: Fix an issue where _skippedCharacterSet would get dealloc'd early

Found a bug where _skippedCharacterSet would point to bad memory.

Since `_skippedCharacterSet` is a static variable and lives forever, we need to add a `retain` call to it so that it doesn't get autoreleased.