[Swift 1.2] Use nullability and nonnull in Objective-C
[Swift 1.2] Use nullability and nonnull in Objective-C

hejunbinlan/QueryKit,QueryKit/QueryKit,hejunbinlan/QueryKit,RyanTech/QueryKit,RyanTech/QueryKit,kostiakoval/QueryKit,QueryKit/QueryKit,kostiakoval/QueryKit