MINOR Using Object::create() in DevelopmentAdmin to make objects mockable
ENHANCEMENT Added Security::$force_database_is_ready to mock database_is_ready() state
ENHANCEMENT Added permission check exception in TaskRunner and DatabaseAdmin if SapphireTest::is_running_test() returns TRUE (necessary for DevelopmentAdminTest)
git-svn-id: svn://svn.silverstripe.com/silverstripe/open/modules/sapphire/branches/2.4@107415 467b73ca-7a2a-4603-9d3b-597d59a354a9