R1:31a2bebf633b

Move PhabricatorTagView to PHUITagView

Summary: For consistency and great justice.

Test Plan: tested audit, uiexamples, action headers

Reviewers: epriestley, btrahan

Reviewed By: epriestley

CC: Korvin, epriestley, aran

Differential Revision: https://secure.phabricator.com/D7967