Bump version number
Add a method to combine two Cartfiles
Load and consider Cartfile.private, if it exists
Move Quick, Nimble, xcconfigs to Cartfile.private
Explain Cartfile.private in the Artifacts document
Merge pull request #247 from Carthage/private-cartfile

Cartfile.private
Merge remote-tracking branch 'origin/master' into 0.5-development
Merge pull request #240 from Carthage/0.5-development

0.5: Pit of Loneliness