Add warn_unused_result to Action.apply
Add warn_unused_result to Action.apply

PSPDFKit-labs/ReactiveCocoa,ikesyo/ReactiveCocoa,rpowelll/ReactiveCocoa,sandyway/ReactiveCocoa,rpowelll/ReactiveCocoa,yonekawa/ReactiveCocoa,natestedman/ReactiveCocoa,walkingsmarts/ReactiveCocoa,llb1119/test,paulyoung/ReactiveCocoa,Farteen/ReactiveCocoa,Juraldinio/ReactiveCocoa,yonekawa/ReactiveCocoa,kevin-zqw/ReactiveCocoa,esttorhe/ReactiveCocoa,smilypeda/ReactiveCocoa,Juraldinio/ReactiveCocoa,esttorhe/ReactiveCocoa,llb1119/test,yonekawa/ReactiveCocoa,beni55/ReactiveCocoa,tonyarnold/ReactiveCocoa,natestedman/ReactiveCocoa,tzongw/ReactiveCocoa,andersio/ReactiveCocoa,tzongw/ReactiveCocoa,calebd/ReactiveCocoa,esttorhe/ReactiveCocoa,ReactiveCocoa/ReactiveSwift,natestedman/ReactiveCocoa,tonyarnold/ReactiveCocoa,walkingsmarts/ReactiveCocoa,paulyoung/ReactiveCocoa,beni55/ReactiveCocoa,esttorhe/ReactiveCocoa,PSPDFKit-labs/ReactiveCocoa,Farteen/ReactiveCocoa,RuiAAPeres/ReactiveCocoa,ohwutup/ReactiveCocoa,walkingsmarts/ReactiveCocoa,sandyway/ReactiveCocoa,ohwutup/ReactiveCocoa,paulyoung/ReactiveCocoa,sandyway/ReactiveCocoa,ReactiveCocoa/ReactiveSwift,kevin-zqw/ReactiveCocoa,victorlin/ReactiveCocoa,tzongw/ReactiveCocoa,calebd/ReactiveCocoa,RuiAAPeres/ReactiveCocoa,PSPDFKit-labs/ReactiveCocoa,victorlin/ReactiveCocoa,andersio/ReactiveCocoa,Juraldinio/ReactiveCocoa,ohwutup/ReactiveCocoa,RuiAAPeres/ReactiveCocoa,andersio/ReactiveCocoa,victorlin/ReactiveCocoa,tonyarnold/ReactiveCocoa,Farteen/ReactiveCocoa,llb1119/test,ReactiveCocoa/ReactiveSwift,smilypeda/ReactiveCocoa,beni55/ReactiveCocoa,calebd/ReactiveCocoa,ikesyo/ReactiveCocoa,smilypeda/ReactiveCocoa,rpowelll/ReactiveCocoa,kevin-zqw/ReactiveCocoa