fix Invalid DeliveryMode=0 on RPC #262
Merge pull request #264 from micdenny/fix-rpc-invalid-deliverymode

fix Invalid DeliveryMode=0 on RPC #262
add IScheduler and RabbitScheduler porting all the BusExtensions methods
RabbitScheduler refactored using IAdvancedBus instead of IBus
renamed RabbitScheduler in simple Scheduler
add on IBus the property to return an instance of IScheduler and use it in the extension methods
removed duplicated bus extension class
moved all the remaining RabbitBusExtensions in the Scheduler class