Enable legacy support for Saga naming

Previous versions of NServiceBus employed a flawed method for naming the RavenDB collection for sagas. For certain systems, during an upgrade and even after it's complete, we need to provide support for it to prevent systems relying on it from breaking down.
Check storage connectivity when created / provided

Closes #26
Incorporate RavenDB fix for DTC usage, also requires build >= 2900

Closes #28