Add other backends (including local)

[sgtpep]

Personally, I don't want to rely on proprietary Parse backend. Moreover I already have homedir synced across computers, so I don't need to rely on any remote storage.

I would be great to see a support for more backends.

[rev087]

I was thinking about abandoning Parse in favor of a Sqlite database stored in a local folder, delegating the sync to whatever service the user prefers.

Parse is great and really easy to use, but I share your concern with privacy, not to mention the added latency by using an online service.

Also, the kind of people who would be ok with Parse (and Facebook behind it since the acquisition) storing their data are really outside the audience for a command-line tool.

So yeah, I'm soon moving to Sqlite or some other offline/self hosted solution.