Strip the ^ in every case for file.uncomment

Whoops, missed one in my previous pull request.
Remove empty group tests (you can't have a user in no groups)
0.13.2 package update
Merge pull request #4071 from basepi/testfixes

Remove empty group tests (you can't have a user in no groups)
Merge pull request #4070 from basepi/fileuncomment

Strip the ^ in every case for file.uncomment
Merge branch 'develop' of github.com:saltstack/salt into hotfix/fix-travis-again