Add UITableViewCell.rac_prepareForReuseSignal
Fix incorrect sample in -rac_signalForSelector: docs
Forward-declare RACSignal
Argh missing imports
Fix building and linking of the UIKit test host
Remove UIActionSheetRACSupportSpec

Since programmatic dismissal doesn't invoke the delegate method we care
about, this test doesn't work.
Unit tests for UITableViewCell+RACSignalSupport
Merge remote-tracking branch 'origin/2.0-development' into prepare-for-reuse-signal

Conflicts:
	ReactiveCocoaFramework/ReactiveCocoa.xcodeproj/project.pbxproj
Merge pull request #705 from ReactiveCocoa/prepare-for-reuse-signal

-[UITableViewCell rac_prepareForReuseSignal]