mkalkbrenner: fixed rare fatal error "Call to undefined function apache_request_headers()" if property system:http_header is used in combination with ThemeKey Debug and drush
mkalkbrenner: fixed warnings in themekey_browser_detection.php
#1263032 by greg.1.anderson: Add primary key to role_watchdog table so that it can be views enabled
#1151842 by scristian: Do not rely on $account object for prior roles state
#1408090 by kevee: Provide administrative overview page
#1517028 by greg.1.anderson: Log role changes that users make to their own account
#1516742 by greg.1.anderson: Add og_role_watchdog to support og