Not able to swipe back if HNWebViewController is visible and bars are hidden

[maicki]

Seems like when hidesBarsOnSwipe and hidesBarsOnTap is true on the nav controller and therefore the bars are hidden in the HNWebViewController it's not possible to swipe back anymore.

On that note, I think the most straightforward way would be to push through with the SFSafariViewController(#12) as imho it would be a better web experience in general.