Phlux v0

Summary:
Yup, it's sitevars.

No conduit or caching or fancy stuff yet.

Ref T2793.

Test Plan:
{F36525}
{F36526}
{F36527}
{F36528}
{F36529}

Reviewers: btrahan

Reviewed By: btrahan

CC: aran

Maniphest Tasks: T2793

Differential Revision: https://secure.phabricator.com/D5397