R1:930b6fec253b

DRAFT - throw together Phurl skeleton.

Summary: DRAFT - throw together Phurl skeleton.

Test Plan: The idea is that `some/long/url` will become `install/Udet4d` and can be viewed and edited at `install/Udet4d/view` and `install/Udet4d/edit`, respectively?

Reviewers: #blessed_reviewers, epriestley

Reviewed By: #blessed_reviewers, epriestley

Subscribers: joshuaspence, chad, epriestley, Korvin

Maniphest Tasks: T6049

Differential Revision: https://secure.phabricator.com/D13681