Changes in editor are lost if not explicitly saved

[fimdomeio]

Describe the bug
The Ledger editor should automatically save the file. If user makes edits and changes views without saving, changes are lost.

To Reproduce

1. Go to Ledger / Editor
2. Make a change
3. Click on Paisa main page

Expected behavior
As a user I was expecting file to be automatically saved or a warning before leaving the page, not for changes to be lost.

thank you for your work and making it open source.

[ananthakumaran]

This is fixed on master. Please re-open if I haven't covered any cases where it's possible to lose edits.