proc: add Waiter class - a lightweight helper class for wait() function (replacement for event). fix Source to use Waiter
proc: add Waiter class - a lightweight helper class for wait() function (replacement for event). fix Source to use Waiter

tempbottle/eventlet,collinstocks/eventlet,lindenlab/eventlet,collinstocks/eventlet,lindenlab/eventlet,lindenlab/eventlet,tempbottle/eventlet