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.
Merge pull request #47 from geertvh/master

keyword algorithm integration test
Added unit tests for class UserManager.
Updated test summaries.
Added unit tests for class FeedbackManager.
Removed unused imports.
Commited merge for authentication
deleted unneeded service reference
Merge remote-tracking branch 'upstream/master'
added missing summaries

- keyword algorithm methods in question manager made internal and added
the internalsVisible attribute so that the integration test can see
these methods.