Eric Tang

Add support for interactive transitioning

1

https://github.com/material-motion/transitioning-objc/issues/3

Add interactive sliding menu as an example

1

https://github.com/material-motion/transitioning-objc/issues/20

Just like https://github.com/material-motion/transitioning-objc/issues/20, except if the user does not lift their finger, the menu will follow their finger