Fix `CocoaAction` KVC issues.
Fix `CocoaAction` KVC issues.

ikesyo/ReactiveCocoa,victorlin/ReactiveCocoa,ReactiveCocoa/ReactiveSwift,ohwutup/ReactiveCocoa,walkingsmarts/ReactiveCocoa,victorlin/ReactiveCocoa,victorlin/ReactiveCocoa,ReactiveCocoa/ReactiveSwift,ReactiveCocoa/ReactiveSwift,calebd/ReactiveCocoa,sandyway/ReactiveCocoa,ikesyo/ReactiveCocoa,ohwutup/ReactiveCocoa,sandyway/ReactiveCocoa,calebd/ReactiveCocoa,calebd/ReactiveCocoa,walkingsmarts/ReactiveCocoa,ohwutup/ReactiveCocoa,sandyway/ReactiveCocoa,walkingsmarts/ReactiveCocoa