* Add this service as part of the PubSubClient services for dep
injection (it is needed by PublisherCore)
* Get rid of PublisherCore's default constructor, so dep injection
treats the tag handler factory as a required param (fails if it isn't
available)
- Replace the default ctr with a static "Create" fn, so code that
hasn't been updated to use dependency injection can still use that.
- Use PubSubConfig.Instance (runtime) instead of compile time Default
* Fix compile time Default config
- In fallback handler config, change Tag from "" to ".*" and move it
from the beginning of the list to the end (it should be the last
resort, not the other way around).
John Colvin