added waitable fixture
added waitable fixture

jhedstrom/Mink,jhedstrom/Mink,Chekote/Mink,stof/Mink,talib570/Mink,Behat/Mink,aik099/Mink,jordi12100/Mink,talib570/Mink,Chekote/Mink,handrus/Mink,minkphp/Mink,jordi12100/Mink,minkphp/Mink,ministryofjustice/Mink