Streamlined the implementation of composed property.
Streamlined the implementation of composed property.

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