Add support for prefers-reduced-motion media query (animate-css#832)

Feat: add prefers-reduced-motion media query

Improve accessibility by respecting the user's preference

Resolve merge conflicts

Co-Authored-By: gianjohansen <[email protected]>

Merge pull request animate-css#550 from andreamaiolo/master

[bower.json] source dir removed from the ignore array

Update dependencies and copyright

Switch from Grunt to Gulp

Various bug fixes

Bug fixes & prefix updates

Add jello animation, match master

Sass/4.0

Use translate3d instead of X/Y