* 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.
