Merge pull request ReactiveCocoa#2357 from ReactiveCocoa/rac4-changelog

Update changelog for v4 alpha

Merge pull request ReactiveCocoa#2334 from ReactiveCocoa/raccommand,-…

…my-nemesis

Don't use KVO in RACCommand

Merge pull request ReactiveCocoa#1382 from ReactiveCocoa/swift-develo…

…pment

The Great Swiftening (a.k.a. the new 3.0)

Merge pull request ReactiveCocoa#2155 from ReactiveCocoa/travis-xcode64

[Travis] Switch to Xcode 6.4

Merge pull request ReactiveCocoa#2073 from ReactiveCocoa/framework-ov…

…erview-tweaks

Minor changes to Framework Overview

Merge pull request ReactiveCocoa#2052 from ReactiveCocoa/travis-6.3

Turn travis back on

Merge pull request ReactiveCocoa#2038 from ReactiveCocoa/action-event…

…-signal

Unified events signal on Action

Merge pull request ReactiveCocoa#1961 from larcus94/promises-futures

Add zip and combineLatest array operators

Merge pull request ReactiveCocoa#1966 from ReactiveCocoa/signal-flatten

Flatten operations for signal-of-producers

carthage update