Add tipDirection to PHUIBadgeMiniView

Summary: Makes PHUIBadgeMiniView a little easier to dictate layout. Apply in Timeline.

Test Plan: Tested supercalifragilisticexpialidocious as a badge, saw it align properly.

Reviewers: epriestley

Reviewed By: epriestley

Subscribers: epriestley, Korvin

Differential Revision: https://secure.phabricator.com/D13729