/**
 * Subscribe to an event
 * @param {string} channel Event name
 * @param {object} subscription Module callback
 * @param {object} context Context in which to execute the module
 */
obj.subscribe = function (channel, callback, context) {
    channels[channel] = (!channels[channel]) ? [] : channels[channel];
    channels[channel].push(this.util.method(callback, context));
};

/**
 * Publish an event, passing arguments to subscribers. Will
 * call start if the channel is not already registered.
 * @param {string} channel Event name
 */
obj.publish = function (channel) {
    var i, l, args = [].slice.call(arguments, 1);
    if (!channels[channel]) {
        obj.start.apply(this, arguments);
        return;
    }

    for (i = 0, l = channels[channel].length; i < l; i += 1) {
        channels[channel][i].apply(this, args);
    }
};