Navigation differs between ion-back-button and browser/hardware backbutton

[mhartington]

Internally, we're using router.navigateByUrl in Angular's NavController. This creates a problem where the browser back button and the navigation stack we make are out of sync.

Steps to reproduce

• clone conference app and checkout core-update branch
• navigate to Speakers tab
• click on Burt Bear`,
• click the “back button at the top”, come back to the list of speakers.
• Then click the browser back button and end up at “Burt Bear”

[ionitron-bot]

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