Serve polyfill detecting browser's support

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We are using some polyfills to support some ES2015 features. We are serving those polyfills to all users even who are using evergreen browsers. If we detect the browser support of a feature and supply polyfills according to it. It may help us to

1. Leverage the power of ESNext features
2. Reduce response payload
3. Improve performance

There are already some feature detection libraries out there like Modernizr (supports custom build) FeatureJS.

There is also a Webpack loader for this autopolyfiller-loader