Added test for subscribers retaining disposed disposables.
Abuse the fact -didSubscribeWithDisposable: is only ever passed compound disposables to change the signature.
Fixed RACSubject and RACSubscriber retaining disposed disposables.
Consider a nil NSURLResponse to be an error
Merge pull request #1140 from ReactiveCocoa/better-async-response-check

Consider a nil NSURLResponse to be an error
Observe deallocation of `id<Protocol>` properties.
Break out if the property is a protocol or a block.
Merge pull request #1143 from ReactiveCocoa/observe-deallocation-of-objects-conforming-to-protocol

Observe deallocation of `id<Protocol>` properties.
Changed the expectation to asynchronous since the setting is asynchronous.
Documented the asynchronicity of the NSUserDefaults channel.
Merge pull request #1128 from ReactiveCocoa/subscribers-retaining-disposed-disposables

Subscribers retaining disposed disposables
Nicer wording.
Merge pull request #1150 from ReactiveCocoa/fix-nsuserdefaults-test

Document the NSUserDefaults' channel's asynchronicity.
minor correction
Merge pull request #1156 from numen31337/master

minor correction
++xcconfigs
Fix typo
Merge pull request #1165 from trevorsheridan/patch-1

Fix typo
Merge pull request #1164 from ReactiveCocoa/xcconfigs-bump

Bump xcconfigs for Xc 5 backwards compatibility
Add -[RACSignal mergeWith:]