[Pharo-dev] small refactor on files.pharo.org

[Esteban Lorenzano]

I move old VMs from files.pharo.org/vm <http://files.pharo.org/vm> to 
files.pharo.org/vm/old <http://files.pharo.org/vm/old>

because it was confusing and some students were lost (Stef too :P). 

cheers,
Esteban