Babel-preset for object rest operator

[DoctypeRosenthal]

• Moved configuration from .babelrc to webpack.config (under the js-loader: added 'query' for all presets).
• Added stage-2 presets so object rest operator can be used in your js (this uses the transform-object-rest-spread plugin under the hood).

Please refer also to https://babeljs.io/docs/plugins/transform-object-rest-spread/