Allow users to export their entries

![allyourentry](https://cloud.githubusercontent.com/assets/65323/4551958/d3fa8080-4e79-11e4-81fb-f40a7dd3afa6.jpg)

We repeat this pattern a lot, but I think we could stop.

What if we started passing in `Date`s to our classes that want them, so we don't have to stop the entire world like this?