Improve ngAnimate Documentation to show how to skip ngAnimate-triggered animations

[matsko]

With ngAnimate there is a CSS class called ng-animate which is applied to the element for the duration of the animation. If the user chooses to skip any animations that ngAnimate triggers then they can do so by overriding properties within that ng-animate CSS class. The docs should better reflect how to do this for both 1.3 and 1.4.