add parameter to filter session and note by updated date. Add pagination on sessions and notes. add read only endpoint at root level to list notes
## Mockups data
- `_data/sessions.json` generated with [json-generator](http://beta.json-generator.com/V16d-KsGQ)
- dates are all wrong
- `_data/bacon.json` is 20 lorem ipsum paragraphs
- margins are missing
- no date yet
## How to view mockups
Simply start [jekyll](http://jekyllrb.org) in `/design/`
```
$ jekyll serve
```
and go to [localhost:4000](http://localhost:4000)
## TODO
- [ ] responsive design
- concordancier
- offline/online