Create connector to remote ModeShape instance

There is a JCR connector that allows ModeShape to talk to another local JCR instance, but that doesn't help when the other JCR instance is in another process (not part of a cluster). What we really need for this is a connector that talks to a remote JCR instance. Since JCR is not a remote API, we'd have to fall back on a ModeShape-specific approach.

Luckily we do have the RESTful API, and this connector can use it to push and pull information to/from a remote ModeShape instance. We have the RESTful Client module, so it'd be a matter of writing a connector to use that client module.