Circular checks are broken

[spoike]

Listening to stores in components are broken in 0.1.8.

More info will come as I am debugging this now.

[spoike]

Apparently listening to e.g. the same store in two different components will fail the circular check even though there is no circular loop happening.

Test example

    var tickAction = Reflux.createAction(),
        currentTick = 0;

    var store = Reflux.createStore({
        init: function() {
            this.listenTo(tickAction, this.tick);
        },
        tick: function(tick) {
            this.trigger("tick", tick);
        }
    });

    Console1 = function() {
        this.listenTo(store, this.output);
    }
    Console1.prototype.output = function(tick) {
        console.log('console1;', tick)
    };
    _.extend(Console1.prototype, Reflux.ListenerMixin);

    Console2 = function() {
        this.listenTo(store, this.output); // ERROR'D!
    }
    Console2.prototype.output = function() {
        console.log(arguments);
    };
    _.extend(Console2.prototype, Reflux.ListenerMixin);

    var c1 = new Console1();
    var c2 = new Console2();

    tickAction(currentTick++);