Fix extension support.
• Project now sets "APPLICATION_EXTENSION_API_ONLY" to yes. See PR #63.
• README.md updated to Swift 3 API.
• Checked in new version of Jazzy docs.
• Project now sets "APPLICATION_EXTENSION_API_ONLY" to yes. See PR #63.
• README.md updated to Swift 3 API.
• Checked in new version of Jazzy docs.