Independence day

Breaking changes

• The codebase has been migrated to Swift 2.2
• Promise now has only an empty init. If you used one of the convenience init (with value:, with error: or with value:error:), they now moved to Future.

New features

• Adds value and error properties to Result
• Added a way to initialize Futures through closures
• It's now possible to map Futures through:
  • a simple transformation closure
  • a closure that throws
• It's now possible to flatMap Futures through:
  • a closure that returns an Optional
  • a closure that returns another Future
  • a closure that returns a Result
• It's now possible to filter Futures through:
  • a simple condition closure
  • a closure that returns a Future<Bool>
• It's now possible to reduce a SequenceType of Futures into a new Future through a combine closure
• It's now possible to zip a Future with either another Future or with a Result
• Added merge to a SequenceType of Futures to collapse a list of Futures into a single one
• Added traverse to SequenceType to generate a list of Futures through a given closure and merge them together
• Added recover to Future so that it's possible to provide a default value the Future can use instead of failing
• It's now possible to map Results through:
  • a simple transformation closure
  • a closure that throws
• It's now possible to flatMap Results through:
  • a closure that returns an Optional
  • a closure that returns a Future
  • a closure that returns another Result
• It's now possible to filter Results through a simple condition closure
• Added mimic to Result