Refactor to allow multiple nodes

[jMyles]

Currently, the following barriers exist to administration of multiple nodes:

• CJDNSAdminClient doesn't know or care which node is sending data to it. It has no way of distinguishing one node from another. It makes sense to instantiate a new CJDNSAdminClient for each node. If we do that, we then need to expose node information to the dispatch methods.
• CirqueHendrixListener has no way to tell the frontend which node is calling. Perhaps we want different SockJS instances - one per node? Otherwise, we may want a different URL structure for each (ie, one NamedResource per node).