[Issue #209] Adding conditional in AFURLEncodedStringFromStringWithEncoding to correctly handle cases where '%' is passed in literally, and not interpreted as an escape sequence, which would have previously caused the subsequent string to be nil.
[Issue #209] Adding conditional in AFURLEncodedStringFromStringWithEncoding to correctly handle cases where '%' is passed in literally, and not interpreted as an escape sequence, which would have previously caused the subsequent string to be nil.

skillz/AFNetworking