Try to get psykorebase shipped with git-extras

[Natim]

https://github.com/tj/git-extras

[Natim]

See tj/git-extras#411

[Natim]

git-extras will accept psykorebase if we rewrite it in bash 💃

Actually I am pretty fond of the idea.

[Natim]

Well I did :) https://github.com/tj/git-extras/pull/411/files

[Natim]

The PR have been updated with documentation (man-pages, Commands.md)

[benoitbryon]

:)