Rebranded the auth_userkey plugin to auth_jwt, including changes to namespace, class names, and configuration settings to reflect the new jwt-based authentication mechanism. Updated copyright notices and contact information accordingly. This refactoring also includes the introduction of JWT token management using the Firebase JWT library, replacing the user quick keys.
- Added Moodle 32 and Moodle 33 to Travis.
- Updated Travis to not test mysql in every scenario
- Updated Travis to use Postgres 9.3 (required by Moodle 33+)
- Updated test_that_user_logged_in_and_redirected as newer Moodle defaults to different URL.
