Implemented save

Save button added to scrapbook page header, on click the contents if
.cell-input elements are sent as a json array over to server (/save)
where they are stored in the local .scrapbooks folder.
Scrapbook loading implemented.
Cleanup

Cleanup logging and split functionality from routes/index.js between
routes/scrapbook.js and routes/index.js
Cleanup

Remove usage of deprecated APIs.
Support document renaming
Make "New Scrapbook" button more visible.
Index page UI cleanup
Merge branch 'persistence'