Incremented version number(s).

[jakehawken]

New Features:

• Infinite then and error blocks. Utilizes a child future / linked list pattern.
• Joined futures. Call class method joining and pass in an array of Future objects, and get a single Future<[T]> which will complete when all have succeeded or any have failed.
• Added similar syntactic sugar to StreamState as exists on Result: .onNew(_:) and .onError(_:)
• Added handy, static preResolved(value:) and preRejected(error:) methods for synchronous/immediate futures.
• Added .map(_:) method to Future for translating from one future to another.
• Added finally(_:) block to future that executes on either type of completion.
• Improved performance and thread safety.
• Future now uses a single Result<T>? under the hood instead of two separate optionals (T? and Error?)

[jakehawken]

For reference, here is the full diff against v0.1.0.