Event: Add touch event properties, eliminates need for a plugin

Fixes gh-3104
Closes gh-3108

See https://github.com/aarongloege/jquery.touchHooks

Other properties are already present thanks to mouse events.

squash! Add targetTouches

src/event.js

@@ -595,6 +595,7 @@ jQuery.each( {
 	altKey: true,
 	bubbles: true,
 	cancelable: true,
+	changedTouches: true,
 	ctrlKey: true,
 	detail: true,
 	eventPhase: true,
@@ -615,7 +616,9 @@ jQuery.each( {
 	offsetY: true,
 	screenX: true,
 	screenY: true,
+	targetTouches: true,
 	toElement: true,
+	touches: true,
 
 	which: function( event ) {
 		var button = event.button;