Also fixes moving notes by arrow keys.
Removed left click detection IE8 hack we inherited from the original
visionmedia/page.js code (cf. https://unixpapa.com/js/mouse.html) as
proper KeyboardEvent.key was introduced in IE9 and it's time to move on.
ArrowUp/Down/Left/Right names have to be mangled to maintain IE9 compat.
- Controller lifetime is bound to route lifetime
- View lifetime is bound to controller lifetime
- Control lifetime is bound to view lifetime
- Enhanced event dispatching
- Enhanced responsiveness in some places
- Views communicate user input to controllers via new event system
- Move controls to the "controls/" directory
- Make controls interface look similar to each other
- Prefix "private" methods and attributes with underscore
