Fixed uncatched error and moved configurations to new file

[bovesan]

[clark800]

It looks like this would make the program exit with an exit code of zero even when it failed to restore files; I don't think we can do that. And even though a separate config file is cleaner design, it adds more complexity for users who don't know how to use git.

[clark800]

I think this is another solution to the same problem, but it was never merged because there isn't sufficient testing: https://github.com/clark800/dropbox-restore/pull/24/files

[bovesan]

Not sure what to make of those [404] errors on client.revisions(). It seems they only occur on existing files, so I can't see why they cannot be ignored.