Credit Visibility

If Admin is loged-in:
- Can index all credits
- On a users profile, views all credits given to that user.

If Merchant User is logged-in:
- On credit index views all credits given by the merchant
- On a user profile, views all credits given by the merchant to that
user

If a User is logged-in:
- At the Credit Tab(…profiles/id) views his credit.

Still a hole that a user can view other user's credit.