Small page header change.
Corrected test user's base domain.
Granted admin role grant management permissions.
Added the JSONRepresentable abstraction to make the utilities more flexible.
Added user list method.
Updated AppEngine libraries to 1.9.15.
Support for multiple roles.
Added support for deleting records.
Added multi-value parameter support.
Added additional test user.
Added the ability to...
 - get user by ID
 - update user attributes
 - get all role names
 - revoke role grants
Added user and role management UIs.