Feature: NumberController + mouseWheel

[avkudr]

Hello

First of all, thank you for your amazing work!

I've just added a new feature to allow the modification of the value in NumberController using mouse wheel. Scrolling up increments the value by the step defined by user, scrolling down makes the inverse.
The mouse cursor should be over the parameter you want to modify.

Actually, I needed this feature to be able to smoothly modify the values of NumberController without writing explicitly the new value and do it fast. I found that it is quite complicated to do with mouse dragging when the interval of change is big (line [-200;200]) and the step is small (0.25 for example).

I tested the code in:

• Firefox 57.0.1
• Chrome 53.0.3239.108
  All tests in "tests/index.html" are passed :)

New dependency: "jquery-mousewheel"

Pull request contains also the rebuilt distribution files with this change.

[donmccurdy]

Thanks @Argon24! Would the wheel event work in all browsers? It's supposed to be available in IE9+.

And, could you remove the build/* files from this PR? They'll be updated automatically with each version release.

[avkudr]

I've done new tests with:

• Safari 11.0.1 (13604.3.5)
• Microsoft Edge 40.15063.674.0
• Internet Explorer 11.786.15063.0
  Everything works fine.

I've also deleted files from build/*