Xcode 10 Support

This release fixes issues preventing the library from compiling using Xcode 10. The Swift language version is not 4.2 yet, to retain compatibility with Xcode 9.

Parallax & Split View

This release introduces two major new features:

• Parallax - on iPad, tabs will scroll in a parallax, similar to Safari for iPad
• Split view - Drag a tab to the right side of the screen, and open split view.