Code which generates .exobrainrc file for the first time

[pjf]

This may be part of the installer, and we may completely move away from .ini files entirely, but otherwise it's pretty essential that that we have a generator so people can easily install exobrain.

--- Want to back this issue? **[Post a bounty on it!](https://www.bountysource.com/issues/1388246-code-which-generates-exobrainrc-file-for-the-first-time?utm_campaign=plugin&utm_content=tracker%2F347315&utm_medium=issues&utm_source=github)** We accept bounties via [Bountysource](https://www.bountysource.com/?utm_campaign=plugin&utm_content=tracker%2F347315&utm_medium=issues&utm_source=github).