Replace submodule dependencies using Carthage

Conflicts:
	Cartfile
	Cartfile.lock
	Carthage.checkout/LlamaKit
	Carthage.checkout/Nimble
	Carthage.checkout/Quick
	Carthage.checkout/ReactiveCocoa
	Carthage.checkout/xcconfigs
Merge branch 'carthage-managed-submodules' into self-hosting-carthage
Merge branch 'carthage-managed-submodules' into self-hosting-carthage
Merge pull request #83 from Carthage/self-hosting-carthage

Self-hosting Carthage