Revert "[Travis] Split Carthage jobs"
Revert "[Travis] Split Carthage jobs"

This reverts commit 67f4364cede4e9a1d9f122faa942af4e59165712.

Intends to reduce the number of Travis OS X build jobs.

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