Fixed: Try methods in AuthorizationHandler could still throw exceptions.
Added context for OpenID; added UserManager.

UserManager implementation will follow.
Updated UserManager.
Added class UserSource.
Simplified authorization.
Removed unused imports.
Updated authorization code.
Updated structure.
Updated comments.
Specified which exceptions to catch.
Updated managers.
Added unit tests for class UserManager.
Updated test summaries.
Added unit tests for class FeedbackManager.
Removed unused imports.
Commited merge for authentication