Added polyfill for ES6 collections (I need Set implementation)
Added polyfill for ES6 collections (I need Set implementation)

cazacugmihai/codebrag,cazacugmihai/codebrag,softwaremill/codebrag,cazacugmihai/codebrag,cazacugmihai/codebrag,softwaremill/codebrag,softwaremill/codebrag,cazacugmihai/codebrag,softwaremill/codebrag