R1:ef768f9694eb

Use phutil_utf8_hard_wrap() in Phabricator

Summary: See D1433.

Test Plan: Created a new diff with a line >80chars, observed it wrapping
correctly.

Reviewers: btrahan, jungejason

Reviewed By: btrahan

CC: aran

Differential Revision: https://secure.phabricator.com/D1438