Move to specta/specta, specta/expecta, and XCTest
Only build the active architecture to test iOS
Merge pull request #1393 from ReactiveCocoa/xctest

Move to specta/specta, specta/expecta, and XCTest
Lift with a signal of tuples of arguments.
Merge pull request #1398 from ReactiveCocoa/lift-with-signal-of-arguments

Lift with a signal of tuples of arguments.