R1:47f2df5f5118

Fix most timeline escaping

Summary: Some content might be broken but it's hard to test since JS/Ajax is also a bit broken.

Test Plan: Looked at timeline examples.

Reviewers: vrana

Reviewed By: vrana

CC: aran

Maniphest Tasks: T2432

Differential Revision: https://secure.phabricator.com/D4683