Merge pull request ReactiveCocoa#1741 from kirillyakimovich/master

[UPD] we really don't want to call description without debug

The RAC.Swift APIs, before being rewritten with SignalProducer/Signal

Merge pull request ReactiveCocoa#1680 from ReactiveCocoa/pacify-xcode

Pacify Xcode

Merge pull request ReactiveCocoa#1680 from ReactiveCocoa/pacify-xcode

Pacify Xcode

Merge pull request ReactiveCocoa#1678 from ReactiveCocoa/backport-rac…

…queuescheduler-lldb-fixes

Backport RACQueueScheduler lldb/swift fixes

Merge pull request ReactiveCocoa#1337 from ReactiveCocoa/code-style-f…

…ixes

Code style fixes

Merge pull request ReactiveCocoa#1658 from ReactiveCocoa/carthage-0.5

Migrate to Carthage 0.5

Merge pull request ReactiveCocoa#1595 from ReactiveCocoa/weak-references

Use weak references in KVO observation

For Carthage eyes only! (Please do not use!)

swift-development, tagged for Carthage (DO NOT USE OTHERWISE)