CommandLine v2.2.0-pre1

Prerelease with Swift 2.2 / Swift Package Manager and Linux support. A few tests still fail on Linux, so use caution.

Other changes include:

• Prevent reusing short or long flags (#39, #53)
• Provide a hook for custom output formatting (#54)
• Add support for stray values (#56)

CommandLine v2.0.0

CommandLine v2.0.0 requires Xcode 7 / Swift 2.

• Use new Swift 2 error handling (#19)
• Allow callers to specify a destination and error when invoking printUsage() (#20)
• Options can be specified with either a short flag, long flag, or both (#25)
• Add wasSet property to Option classes (#26)

CommandLine v1.2.0

CommandLine v1.2.0 requires Xcode 6.3 / Swift 1.2.

• Add instructions on using frameworks in a command line tool (#11)
• Update to Swift 1.2 (#12)
• Fix array index out of range error when a bare - is passed (#16)
• Add strict parsing mode (#17)

CommandLine v1.0.0

First released version of CommandLine. Requires Xcode 6.2 / Swift 1.1.