Add option to prefetch props via <Link> component

[adamsoffer]

Per @rauchg's suggestion, this option should be explicit:

<Link prefetchProps={true} />

Adding the ability to prefetch props has some seriously cool implications, the most obvious being that it essentially sounds the death knell for loading indicators.

[gmaliandi]

Hi! We just blogged about a way of doing this by adding a caching layer and calling getInitialProps when prefetching a page.

[timneutkens]

@gmaliandi lets add it to the readme under FAQ 😄

[adamsoffer]

Brilliant!

[gmaliandi]

And today we published this in NPM: data-prefetch-link!

[timneutkens]

Going to close this issue. Core support is not needed thanks to @gmaliandi's brilliant work 👍