Fix TokenGiven stories for Asana

Summary: Ref T6201. This isn't quite perfect but should be good enough. At some point far in the future I plan to revamp feed rendering a bit. This should possibly become a real ApplicationTransaction story eventually, too.

Test Plan:

Reviewers: btrahan, chad

Reviewed By: chad

Subscribers: epriestley

Maniphest Tasks: T6201

Differential Revision: https://secure.phabricator.com/D10625