Added simple IBus.SendAt implementation for future dated commands.
Checked the message type is one of those found at bus build time to prevent sending of messages that do not have topics
Handled race condition creating subscriptions
Merge branch 'simple-timeouts' of github.com:gertjvr/Nimbus into gertjvr-simple-timeouts
Merged Rob's and Gert's changes
fixed up a couple of merge issues
Merge branch 'SubscriptionRaceCondition' of github.com:droyad/Nimbus into droyad-SubscriptionRaceCondition
Merge branch 'droyad-SubscriptionRaceCondition'
Changed message type