* Make sure reading the body of same JSON page request safe.
It's not possible to read the body twice from fetch()'s response
So, we've to clone the response before doing anything.
* Fix tests.
* 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
* 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.
* Make sure lastAppProps always have some value.
* Revert "Make sure lastAppProps always have some value."
This reverts commit b4ae722d9c1a4460e17dbdc041b111cbd492b2aa.
* Throw an error, if we found an empty object from getInitialProps.
* Add proper tests for getInitialProps empty check.
* Write BUILD_ID when building.
It's a random id (uuid.v4())
* Add buildId to the core JS files.
* Add immutable cache-control header.
Only if the buildId is matched.
* Set '-' as the dev buildId always.
* Add buildId handling for JSON pages.
* Move route loading logic to a common place.
* Add router events.
* Add EventEmitter's core API methods.
* Add example app for loading events and docs.
* Fix some typos.
* Get rid of Router.ready()
* Remove events package.
It's already shipping with webpack.
* Handling aborting properly.
* Expose simple attribute based events listener API.
Removed the proposed event listener API from the public API.
* Remove error logged when there's an abort error.
There are many other ways to capture this error.
So, it doesn't look nice to print this always.
* Change router events to pass only the current URL as arguments.
* Add a section about Cancelled Routes to README.
* Immplement the initial singleton Router.
* Use the new SingletonRouter for HMR error handling.
* Use SingletonRouter inside the Link.
* Create an example app using the Router.
* Make the url parameter optional in Router.push and Router.replace
* Add a section about next/router in the README.
