Using parsely-* fields within best_* methods

[oyeanuj]

Hi @jaimeiniesta! Increasingly on blogs and publisher sites, I come across parsely-* tags being reliably present. Noticing how the best_* methods are structured today in a waterfall, what are your thoughts on relying on parsely tags if OG and Twitter tags aren't found.

Here is an example: https://metainspectordemo.herokuapp.com/scrape?url=http%3A%2F%2Fwww.bloomberg.com%2Fnews%2Farticles%2F2016-05-24%2Fas-zenefits-stumbles-gusto-goes-head-on-by-selling-insurance

Thank you!

[jaimeiniesta]

Sounds good, as long as it takes less precedence than the others. But it's always good to have a longer chain of fallbacks.

Go ahead with the PR if you wish!