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feat(pointer): add multi-touch support (#126)

* Initial multi-touch support.

* Update touches example to show onUp and onDown.

* Fix multi-touch code to handle onUp events properly.

* Fix type on example.

* Change example so you can actually reach the code.

* Pass tests.

- Fire callbacks for each touch.
- Check for existance of changedTouches.
- Prevent double firing of touch events.

* Add touch info to pointer.touches.

* Add touchcancel listener.

* Update touches example to show touch IDs.

* Add second multi-touch example that shows tracking.

* Keep events in ID order.

* Ignore mouse events in example.

* Add changedTouches data to test events.

* Update all touch tests to pass changedTouches.

- changedEvents is widely supported and is the most concise way to handle emitting events for only updated touches (flickering).
- caniuse shows support for all but Safari but tests on my phone show Safari is working just fine.
- Match styles from touchend tests.

* Add pointer.touches test to restore coverage.

* Update example to be compatible with core Pointer API.

* Change pointer.touches to map. Update example to demonstrate simplification.

* Update test to account for switch from array to map.

* Update examples for merge.

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