first attempt at passing commands from mcp to the worker(s) via zmq
do not send test messages that are not valid commands
fix the getattr and coerce everything we send out to strings
send reply to the cleint from send_command so it can use call_sync helper from python interactive shell
run with interactive shell to send commands to your worker army
keep the webdriver connection alive by polling the page title every few seconds, log the arguments passed to the command so we know about redirects and whatnot