Rename internal property names.
Rename internal property names.

ohwutup/ReactiveCocoa,calebd/ReactiveCocoa,walkingsmarts/ReactiveCocoa,calebd/ReactiveCocoa,walkingsmarts/ReactiveCocoa,ohwutup/ReactiveCocoa,calebd/ReactiveCocoa,ohwutup/ReactiveCocoa,walkingsmarts/ReactiveCocoa