Fixes #159 running plugin on http server
Fixes #159 running plugin on http server

socket.io requires the protocol to be specified.
The plugins still fail on https server if they are executed on server side.


Former-commit-id: d9aa540619b000ae8514e5c756c2f7f1181f1426
webgme/webgme-engine,webgme/webgme-engine,webgme/webgme-engine