Added edit and update actions to UsersController.
UsersController#edit assigns the organisation as well.
Add template for UsersController#edit
A field agent can't do ANY operation on a user other than himself.
Users#index lists all users, not just field agents.
Add edit links to each user in the users list.
The error flash when updating a user should have the full_messages.
Add the new roles as well as getters to check for those roles.