Actually added several UIKit extensions to the tvOS target
Actually added several UIKit extensions to the tvOS target

This is a follow up to #2651. Did I mention that I hate `Xcode`? Even though I added the files to the `tvOS` target, and they're imported in `ReactiveCocoa.h`, these extensions aren't found in `RC 2`.
Why the hell is this not an error, for importing a non-modular header? I swear I understand Xcode less and less every day. Anyway, with this change, NOW their headers are `public`...

victorlin/ReactiveCocoa,andersio/ReactiveCocoa,tzongw/ReactiveCocoa,walkingsmarts/ReactiveCocoa,victorlin/ReactiveCocoa,tzongw/ReactiveCocoa,rpowelll/ReactiveCocoa,ReactiveCocoa/ReactiveSwift,RuiAAPeres/ReactiveCocoa,ikesyo/ReactiveCocoa,victorlin/ReactiveCocoa,walkingsmarts/ReactiveCocoa,tonyarnold/ReactiveCocoa,smilypeda/ReactiveCocoa,rpowelll/ReactiveCocoa,RuiAAPeres/ReactiveCocoa,tonyarnold/ReactiveCocoa,RuiAAPeres/ReactiveCocoa,andersio/ReactiveCocoa,kevin-zqw/ReactiveCocoa,ohwutup/ReactiveCocoa,andersio/ReactiveCocoa,ikesyo/ReactiveCocoa,kevin-zqw/ReactiveCocoa,Juraldinio/ReactiveCocoa,ohwutup/ReactiveCocoa,walkingsmarts/ReactiveCocoa,tonyarnold/ReactiveCocoa,ohwutup/ReactiveCocoa,Juraldinio/ReactiveCocoa,calebd/ReactiveCocoa,calebd/ReactiveCocoa,sandyway/ReactiveCocoa,ReactiveCocoa/ReactiveSwift,tzongw/ReactiveCocoa,sandyway/ReactiveCocoa,kevin-zqw/ReactiveCocoa,calebd/ReactiveCocoa,smilypeda/ReactiveCocoa,rpowelll/ReactiveCocoa,Juraldinio/ReactiveCocoa,sandyway/ReactiveCocoa,ReactiveCocoa/ReactiveSwift,smilypeda/ReactiveCocoa