Add command support for UIRefreshControl
Add RACControlCommandExamples to UIKit tests

To be used for UIRefreshControl testing.
Add UIKit tests for UIRefreshControl
Publicize UIRefreshControl+RACCommandSupport.h
Eliminate nested subscription
Verify -endRefreshing is called
Break retain cycle
Revert "Break retain cycle"

Thanks to @erikprice for pointing that I was mistaken.

This reverts commit 113c8b2329071c4fe500e3be838e35b42cd06f1b.
Verify -endRefreshing is called on error
Simplify signal composition for refreshing
Merge pull request #873 from ReactiveCocoa/refresh-control-command

UIRefreshControl command support
Merge pull request #878 from ReactiveCocoa/deprecations

Remove implementations deprecated in 2.0, add RACDeprecated macro, deprecate RACBehaviorSubject
Merge branch 'master' into 3.0-development
More efficient implementation of objectPassingTest and any on RACSequence.

Only evaluates enough of the list to return a response, instead of evaluating the entire sequence.
Use tabs not spaces
Merge pull request #888 from ansel1/master

More efficient implementation of objectPassingTest and any on RACSequenc...
Merge remote-tracking branch 'origin/master' into 3.0-development
Merge branch '3.0-development' into signal-provider