* Revert "Update Webpack + deps, remove now unnecessary polyfills (#2410)"
This reverts commit 189b34c45a.
* Fix build (#2496)
* Change syntax to see if build passes
* Test commit
* Test with node 10
* Test adding all browsers in travis
* remove other browsers when running on travis
* Update parseHeaders to match node http behavior
Node ignores duplicate entries for certain HTTP headers.
It also always converts the `set-cookie` header into an array.
* add tests for new duplicate header handling
* clarify comment