Persist the current state of the web app #5
Description
It's very annoying to lose all your work by accidentally refreshing the page, or if the app crashed because of issues related to #1 or #2. To prevent this, we can use web storage to save the state of the app.
Make sure to check what Angular offers regarding web storage (e.g. angular-webstorage-service) before falling back to the low-level javascript API.