Link from Blame Revision

Summary: There can be Dxxx, rXXXxxx or even full URL in Blame Revision field
so just highlighting it as normal text would work probably best

Test Plan:
Go to https://secure.phabricator.com/D277
You should see a link from Blame Revision (if it would be displayed)

Reviewers: epriestley

Reviewed By: epriestley

CC: aran, epriestley

Differential Revision: https://secure.phabricator.com/D1274