R1:85cc15b56ddc

Recognize merchant authority in Fund initiatives

Summary: Update fund for new merchant authority stuff.

Test Plan:
- Created a secret initiative.
- Could see related activity as merchant.
- Could not see it not-as-merchant.

Reviewers: btrahan

Reviewed By: btrahan

Subscribers: epriestley

Differential Revision: https://secure.phabricator.com/D11959