Bump Commandant and ReactiveTask to `master`.
Bump Carthage dependencies
Merge remote-tracking branch 'origin/master' into submodules-and-tigers-and-bears-oh-my

Conflicts:
	Cartfile
	Cartfile.lock
	Carthage.checkout/ReactiveTask
Merge pull request #220 from Carthage/submodules-and-tigers-and-bears-oh-my

Bump Commandant and ReactiveTask