Change the vagrant profile
Change the RVM group creation as the Vagrant user was never added to the RVM Group.
The group is created depending on a Group ID if necessary
Users would be added in appending
And Vagrant user is added in appending to the group in case of the vagrant recipe usage
do not execute GROUP if you don't have data in group users the only_if didn't work properly
that's why there is a complementary test

The only if is there for Foodcritic test purpose
Merge branch 'master' of https://github.com/gpsnail/chef-rvm

Conflicts:
	attributes/default.rb