Re: [touch-events] Added legacy interface initTouchEvent (#47)

Sure I will add `createTouch` and `createTouchList` in another branch.

For  `scale` and `rotation`, [Apple's doc](https://developer.apple.com/library/iad/documentation/UserExperience/Reference/TouchEventClassReference/index.html#//apple_ref/javascript/instm/TouchEvent/initTouchEvent) says they are optional, but actually all arguments are required in Safari. Do we want to match docs or shipped code?

For those unused arguments I've renamed them to `unused` and added note about it, but for the change list I need to update commit link after landed.

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