Add a way to load/dumb invoices/contacts information

[ecleel]

Please answer these question so I can help you faster.

Is it a bug or a feature request?

• It's a bug.
• I'm requesting a new feature.

Which version are you using?

• macOS
• Windows
• Linux

Which is the version/distribution of the OS?

I'm using macOS High Sierra

Describe your issue

It would be cool if there is a way to load and dump the information of invoices and contacts automatically. This will make Manta work on multiple workstations without any issue. I found this amazing lib that can do load/dump data from pouchedDB easily. pouchedDB-load

[hql287]

Exporting is being worked on in #96 but I'm not sure what's the current status is.

Importing is nice, any idea on how this should be implemented? I'm not sure if it's possible to import directly from the Contacts app so maybe Contacts App -> CSV/Excel -> Import?