Don't highlight hyperlinks in monospaced text
Summary:
It should be possible to denote unclickable hyperlinks somehow.
NOTE: BC break, it will cause double escaping if applied after EscapeHTML.
Test Plan: Write Error connecting to http://127.0.0.1/.
Reviewers: epriestley
Reviewed By: epriestley
CC: aran, epriestley
Differential Revision: https://secure.phabricator.com/D1913