Added virtualenv to dependencies' list

(It isn't shipped with python on ArchLinux for exemple)
Merge pull request #47 from NougatRillettes/README-NougatRillettes

Added virtualenv to dependencies' list
Close #43
Let's not discriminate !

(hence explanation of the name to make easier to remember)
Explanation of how reSRC works, what is a link, what is a list.
Typofix
Remove bad tests