role_watchdog 6.x-2.0-beta1

#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