update Berksfile, switch home dir to use username attribute in path
Merge branch 'upstream' into jenkins-upstream-15
add integration group to berksfile
Merge branch 'master' of https://github.com/rackops/rackspace-user into jenkins-upstream-15
Merge pull request #19 from rackspace-cookbooks/jenkins-upstream-15

merges from rackspace-user - upstream