Use MessageDeliveryModeStrategy

Here are fixes that I missed introducing MessageDeliveryModeStrategy
Merge remote-tracking branch 'upstream/master' into persisten-attribute-fix

Conflicts:
	Source/EasyNetQ/RabbitBusExtensions.cs
Merge branch 'master' of github.com:mikehadlow/EasyNetQ
Merge pull request #252 from Pliner/persisten-attribute-fix

Use MessageDeliveryModeStrategy