replace kwarg with manually setting the ctnr
Merge pull request #730 from murrown/nameserver_ctnr_fix

Nameservers correctly set container
Check user permissions before allowing them to become someone else
Fix test_become_user to handle new become_user permissions checking, replace improper use of unittest assert methods.
Merge pull request #735 from zeeman/fix_becoming

Fix security issue with becoming a user
Do not check container's domain against record's domain in DNS permissions checks
fix ctnrless objects in tests
Merge pull request #739 from murrown/fix_obj_ctnr_domain_check

Do not check container's domain against record's domain