Fork #123 of feat(options): Add a hrefFn option to build the URL to prefetch.

[gilbertococchi]

This is a fork of #123 with test fixes to be able to merge this into the main repo.

@addyosmani, @thearegee FYI

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[gilbertococchi]

@ruben0626 to review

[addyosmani]

Overall changes LGTM. One request: can we add a recipe/example of usage to the README? We currently have an API entry but showing how developers should use this new option would also be helpful.

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[gilbertococchi]

@addyosmani sure you are right, I've added a simple example within the demos folder here 769653c.

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[addyosmani]

LGTM with some minor changes.

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[addyosmani]

LGTM