also support Redhat osfamily
typo: replaced bare word with variable's content
osfamily should be Debian on Ubuntu
unfortunately I don't have an Ubuntu at my disposal, so I'll check what
travis is saying
apparently on some Ubuntus, osfamily is Ubuntu, on others it's Debian
o_O
Merge pull request #16 from ccin2p3/f/extract-parameters

also support Redhat osfamily in init.pp