A way to return to the last space

[Konard]

Now, if we exit the space, we get to the user.
But if we entered space within space within space, we may have not expected behavior.

The expected behavior, that we somehow keep track of that spaces and in which order user have visited, so user may return if he entered the next space by mistake, or for some other reason.

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Forked from deep-foundation/deepcase#83 by https://github.com/konard/gh-org-migrator