* Add specific test cases for Error Recovery.
* Update hmr/about.js
* Add a test case: should recover after a bad return from the render function
* Add test case: should recover from errors in getInitialProps in client
* Add test case: should recover after an error reported via SSR
* Add a test case: should recover from 404 after a page has been added
* Refactor code base.
* Reload webpack via hot-reloader when needed.
We need to do this specially we removed a previosly
built page from the filesystem.
* Make sure reloading is happen only once
* Reload only if there's a missing page error.
* Remove debug logs.
* 2.4.2
* Refactor the codebase a bit.
* Move some commonly used regexp to a utils module.
* Handle the reloading well when there's a custom error page.
* Add a HMR test case.
* Close the browser in the test case.
* Fix HMR not working issue.
Our hot-reload code on the server has custom webpack error dectection logic.
Is supports only multi-modules entries.
So, we need to all entries as multi-module entries
even if there's just a single entry.
* Add a test case for showing errors over HMR.
