Sort tests by name
Add tests for pipe()
Add tests for interval()
Test HotSignal.map()
Test HotSignal.filter()
Test HotSignal.scan()
Test HotSignal.skip()
Test HotSignal.skipRepeats()
Test HotSignal.skipWhile()
Test HotSignal.take()
Test HotSignal.takeUntil()
Test HotSignal.takeUntilReplacement()
Test HotSignal.takeWhile()
Merge branch 'swift-development' into swift-unit-tests

Conflicts:
	Carthage.checkout/xcconfigs
	ReactiveCocoaTests/Swift/HotSignalSpec.swift
Test HotSignal.deliverOn
Test HotSignal.delay
Test HotSignal.throttle
Test HotSignal.sampleOn
Test HotSignal.combineLatestWith
Test HotSignal.merge