Check timestamp

## 0.0.2 - 2013-08-01

* ```unread_by?``` now checks against the ```readable_options[:on]``` timestamp. (Set on each ```ReadMark``` by an ```after_save``` callback)

![](http://31.media.tumblr.com/a638422c54dc1f1231812072f5224d3f/tumblr_mq26opf31Q1qjt9zdo1_500.gif)