Metadata in 14-day view notebook

To properly implement #15 I think there needs to be a JS block in the rendered 14-day notebook that creates JS globals indicating which days are being displayed. Something like:

``` html
var first_14day_csd 4321; var last_14day_csd 4334;
```

These global variables could then be used by the daily viewer JS to create the necessary UI elements (whatever they are).