4.0.0 - Isomorphic magic applied and the direction

Changelog

• Adding the direction property, having the possibility to scroll left.
  • Talked here and coded here
• Adding the window/document check for Isomorphic applications.
  • coded here

PS: Upgrade the major version because are breaking compatibility with older versions (adding direction).

Release 2.0.0

Implement AnimationFrame for the polyfill and use ES6 with babel/browserify for implement it.