add dual listener when on a touch-enabled browser
build event-touch
Merge branch 'dev-3.x' into dual-listener
Merge branch 'dev-3.x' into dual-listener

Conflicts:
	build/event-touch/event-touch-coverage.js
event-tap now has preventDefault(), works on Android 4.0.x and on mouse/touch enabled devices.

event-tap got a bunch of modifications in this commit:
- Dual listener support! Listens to "touchstart mousedown", and based on which one is captured, sets up listeners for either "touchmove", "touchend", "touchcancel", OR the equivalent mouse events. Now, touch events obviously fire a corresponding mouse event, and I didn't want to have a heavy-handed event.preventDefault() in the code. To prevent the corresponding mouse/click events from firing `touchEnd()`, I set up a `needToCancel` boolean that is toggled once the first `touchstart/mousedown` is captured.

- e.preventDefault() works!  You can now do this:
```
    node.on('tap', function (e) {
      e.preventDefault();
      //do some stuff here...
    });
```
update unit tests to work with commit 9cbc2f6
add manual tap test
Merge branch 'dev-3.x' into dual-listener
Merge branch 'dev-3.x' into dual-listener
code cleanup

- change touchevent check to use event.touches
- add config option for controlling how much `px` movement is
necessary to prevent `tap` from firing
Move mod. to `notifier.prototype.fire()` upstream

Remove the `notifier.prototype.fire()` modification
made in `tap.js` and move it up to `synthetic.js`.

`fire()` now has support for `stoppedFn()` and
`preventedFn()`. Check this gist for details:
https://gist.github.com/lsmith/5986637

Check this thread for background:
https://github.com/yui/yui3/pull/986#discussion_r5151082
fix `filter` arg. not coming through for delegate()
add test coverage for sensitivity param
update manual test with delegate() use-case
s/extras/extra and return object from processArgs()
add sensitivity use-case
add tests for `preventedFn` and `stoppedFn`
s/splice/slice
Fix processArgs() and sensitivity param. evaluation
up test coverage to 100%