Added ability for plugins to register with the router
Added ability for plugins to register with the router

sbender9/signalk-server-node,SignalK/signalk-server-node,webmasterkai/signalk-server-node,SignalK/signalk-server-node,webmasterkai/signalk-server-node,sbender9/signalk-server-node,sbender9/signalk-server-node,SignalK/signalk-server-node,SignalK/signalk-server-node,webmasterkai/signalk-server-node