Listen to other events rather than just 'change'

[tnguyen14]

Currently event bubbling only works for change events (see _getEventBubblingHandler).

In order to emit more custom event types, I had to do the following (notice the else clause):

// base.js
module.exports = State.extend({
    // copy ampersand-state bubble event to support custom event
    _bubbleEvent: function (propertyName) {
        return _.bind(function (name, model, newValue) {
            if (/^change:/.test(name)) {
                this.trigger('change:' + propertyName + '.' + name.split(':')[1], model, newValue);
            } else if (name === 'change') {
                this.trigger('change', this);
            } else {
                this.trigger(name, model, newValue);
            }
        }, this);
    }
});

and then use it like so

// parentView.js
    render: function () {
        this.renderWithTemplate(this);
        this.child = new ChildView();
        this.renderSubview(this.child, this.el);
        this.listenTo(this.child, 'all', this._bubbleEvent('child'));
        return this;
    }

This is sort of a hack, but I can see how this can be useful for other scenarios as well. Would it be good to start supporting more events? It doesn't have to follow the change:property convention, just the event name would be helpful.