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.

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[pjf]

Ideally we want to move to have an ~/.exobrain/config.d directory, which will make it much easier to create and install components and their config.

[pjf]

Class-based agents should now be integrating some sort of setup information into their class, and then we should be using that to generate config. Although #29 should be doing the initial set-up of directory structures and such.