[math4] mongo now in git

[Nadège Michel - Nashella]

Greg Dekoenigsberg a écrit :

> Yes, be my guest.  If you'd like to be added as a committer to the code 
> itself, I can do that, too.

It would be great to be able to commit directly to the mongo repository, 
but as I said, this will be my first Python project ever. I'm not even 
sure I'll commit anything in a near future, but I wouldn't mind having a 
dedicated sandbox branch to toy with this new parser without breaking 
the whole application.