Fixes for issues:

Issue #7 - fix for server invalidly caching result.
Issue #8 - updated to return 401 for missing fields (proto change)
Issue #9 - switch to centralized error reporting (remove dup errors)
Issue #10 - moved websocket service to root (wss://server:port/)
Issue #11 - added "ping" response
Issue #12 - return sent fields with register/unregister reply