Somewhat give Phriction the new Breadcrumb UI.

Summary:
Okay, just a forewarning, this is horrible right now.

But I think it's an okay enough start that it's worth sending what I've done.

This rips out the old Phriction breadcrumb UI and replaces it with the new one
that other apps have been starting to use.

Test Plan: Looked at a bunch of Phriction pages.

Reviewers: epriestley

CC: aran, Korvin

Differential Revision: https://secure.phabricator.com/D4183