Remove Quick/Quick and Quick/Nimble as submodules.
Add Quick and Nimble via Carthage.
Remove workspace.
Remove before script from Travis config.
Update Rake tasks.
Manage dependencies using --no-build option.
Add minimal working engine.
Switch back from raven's fork.
Merge branch 'develop' into carthage-no-build

Conflicts:
	.travis.yml
Add changes to xccheckout by Xcode.
Migrate project to Carthage 0.5.0
Update Quick/Quick.
Use Cartfile.private for private dependencies.
Add example specs.