This reverts commit d8af41d6.

* Fix "EXDEV: cross-device link not permitted" error

* Fix lint errors

Not sure why standard passes in my dev environment, but hopefully this fixes the CI errors.

* Fix logic mistake

Wow, my bad :/

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The change in #1155 to remove server-side gzipping changed static
rendering to no longer return a promise, which broke the Hapi example
that was waiting for a resolved promise before closing the request.

This PR fixes up all render or serve methods of server.js to
consistently either await and/or return. Additionally, it collapses
serveStatic and _serveStatic, as _serveStatic no longer needs to be
factored out.

Without this, modules built with Babel or Webpack would have hard-coded absolute paths
all the way back to the root of the filesystem. This prevented compilation and running
on different machines or even from different directories on the same machine.

With this change, paths are hard-coded to the top-most node_madules directory found,
which should make them portable relative to the app.

Fixes #1160

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* Move the test babel setup to the main babelrc file.

* Add es2015 preset.

* Add support to reload the page when ask to change the same url.

* Do not run change() in the initial page load.

* Add integration tests.

* Add self-reload.js

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* Use stats.json instead of running server

* Add suggested changes

* Implement a very simple prefetching solution.

* Remove next-prefetcher.

* Require 'whatwg-fetch' only in the client.

* Use xhr in the code.

* Use a simple fetching solution.

* Fix 404 and xhr status issue.

* Move the prefetching implementation to next/router.

* Add deprecated warnning for next/prefetch

* Run only 2 parellel prefetching request at a time.

* Change xhr to jsonPageRes.

* Improve the prefetching logic.

* Add unit tests covering the Router.prefetch()

* Update examples to use the new syntax.

* Update docs.

* Use execOnce() to manage warn printing.

* Remove prefetcher building from the flyfile.js
Because, we no longer use it.

* patch-react: copy non-enumerable properties and descriptors

* fix syntax error

* remove getOwnPropertyDescriptors polyfil

* Add notice about getInitialProps

* Remove extra whitespace

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* ssr-caching: document way to configure cache key

* simplify comment

* fix status messages on error

* error: use the special message for 404

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