Changes are as follows:
- Modified Identity service to send back "not found" status to caller (it was previously eating this up and closing the connection)
- Modified loginUser function in rust-node-addon to propagate the not found error to js if encountered
- Wrapped the loginUser call in logInResponder in a try-catch so that if we get back the "not found" error, we attempt a registerUser call instead
Normally I'd make this 3 diffs, but this is urgent