systemed/iD — pull request #1739 by tyrasd (2013-08-24 12:29:20+00:00)
Title: Fix loading graph of unserialized objects. Fixes walkthrough

This is a partial revert of commit 2efafa087b25373ab65b600c12c9f36e2af79f1b, which caused the walkthrough to be broken. The problem was that the walkthrough entities were loaded into the graph without beeing proper `iD.Entity` objects.