Allow full anchors in remarkup object names
Summary: Remarkup object names require #1 for linking to comments which is not
very intuitive.
Test Plan:
D1558#4e01328c D1558#1 D1558#comment-1
Reviewers: epriestley
Reviewed By: epriestley
CC: aran, epriestley
Differential Revision: https://secure.phabricator.com/D1565