pushState for the viewer #55
Description
We're implementing oEmbed endpoints for DocumentCloud resources, and doing so requires real urls for each of our embeddable resource types (documents, notes, pages and searches).
On top of that, oEmbed discoverability (say via our wordpress plugin) is dependent on users being able to get access to those real resource urls.
So... it's time to update the viewer's router/history code (which is almost identical to Backbone's incidentally) to use pushState.