Move `capture` into the `AnyProperty` namespace.
Move `capture` into the `AnyProperty` namespace.

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