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Swift 4

• Updated to Swift 3

• Activate constraints using activate property instead of manually adding them to the view
• StackView now returns true in requiresConstraintBasedLayout
• LayoutGuides are now hidden by default
• LayoutGuides now have translatesAutoresizingMaskIntoConstraints set to false be default

• insertArrangedSubview(_:atIndex:) method now updates the stack index (but not the subview index) of the arranged subview if it's already in the arrangedSubviews list.
• Add app extensions support
• Add tvOS support (useful if you share code between iOS 8.0 and tvOS)

• Make _viewForFirstBaselineLayout private (was made public by mistake)
• Update documentation

• More efficient constraint deactivation on updateConstraints()
• Cleaner arrangements implementation

Initial release