Failing unit test to expose thread-unsafe implementation of -[RACSerialDisposable disposable].
Reimplement RACSerialDisposable with OSSpinLock rather than OSAtomic in order to fix -disposable method to be thread safe.
Formatting.
More code review feedback.
Switch to use CFBridgingRelease.
More code review feedback.
Move all Objective-C sources into their own folder
Move extobjc sources into Objective-C folder too
Move all Swift sources into their own folder
Split specs by language as well
Merge branch 'swift-development' into group-source-by-language

Conflicts:
	ReactiveCocoa.xcodeproj/project.pbxproj
Set bundle ID to org.reactivecocoa.ReactiveCocoa
Merge branch 'xcode6' into swift-development
Update more bundle IDs to be org.reactivecocoa
Merge branch 'swift-development' into group-source-by-language
Merge pull request #1531 from ReactiveCocoa/group-source-by-language

Group 3.0 sources on disk by language
Merge pull request #1456 from talko/serial

Fix lack of thread safety in -[RACSerialDisposable disposable]
Merge remote-tracking branch 'origin/master' into xcode6

Conflicts:
	ReactiveCocoaTests/RACSerialDisposableSpec.m
Merge pull request #1413 from ReactiveCocoa/xcode6

Xcode 6 support
Merge remote-tracking branch 'origin/master' into swift-development