Add phan configuration

Authored by Legoktm on Apr 9 2018, 7:45 AM.


Add phan configuration

In EchoPresentationModelSectionTrait, there's no way for phan to
know that everything that uses that trait extends EchoEventPresentationModel,
so it flags properties and methods as undefined. Those warnings are just
suppressed for now.

Change-Id: I66d81933c89707c6bfae2856036609f46cc4f28a