Since we already knew in the scroll event if the element had resized, the need to check via requestAnimationFrame is not needed, so it was removed along with the dirtyCheck and the polyfill.

The elements old height and width are passed through the callback as an object with the properties `width` and `height`.

Other minor tweaks were made for readability and linting purposes.

Fixed issues:
  - #81
  - #72

Performance:
  - Events are no longer added to each detector. Only one event is attached to listen to all sensors.
  - No longer using timeout functions.
  - Only one EventQueue is created to manage all ResizeSensors
  - Minor refactoring

New Features:
  - ResizeSensor now listens to dynamically added elements. You can create an element in javascript
  - EventQueue accepts and passes arguments to the event listener.
  - ResizeSensor passes extra data that may be useful like the difference of the height and the width from the last resize event