Add Webix to npm / npmjs.com

Webix is on Bower and it should be on NPM as well, because there’s a growing trend of using npm instead of Bower, and bower might be merged into npm.

Plus, extra exposure for free. XB’s marketing department should like that.

It looks like that both Webix UI and Remote are available on NPM:

I add webix using npm and it works fine. The latest version is now published on npm.