* Remove traces of glamor
As talked about with @rauchg. Glamor takes up around 60KB of the bundle (pre-gzip). Since styled-jsx is the way to go now and we support adding glamor by the user we should remove it as dependency cause it is bundled even when not used.
Added rehydration to the example, since we did that in our code.
There is only one thing I'm not sure about and want to discuss:
what should we do with next/css. Right now I added a throw for when it is imported. I'm not sure if we should do that / some other way to notify the user it has been removed. The reasoning behind the throw is that when we would do a console.warn the user would see 'css.default.<X>' not found because we don't have the glamor dependency anymore.
* Update yarn.lock
* Remove test for styles
* 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.
* Remove the use of CDN and bundle everything inside the app.
We still pre-build the prefetcher because it needs
different webpack config which only targets browsers
supports Service Workers.
* Remove cdn config item.
We no longer using it.
* Stop adding script tags when staticMarkup=true
* Remove babel-plugin-transform-remove-strict-mode NPM module.
