function receiveMessageFromBrackets(msgObj) {
        var argList = msgObj.args;
        argList.unshift(msgObj.requester || "");
        functionMap[msgObj.fn].apply(null, argList);
    }
Receives messages from brackets
@param {object} msgObj - json containing - {
                         fn - function to execute on node side
                         args - arguments to the above function }