fix bug 1056950 - only send welcome email when at least one email address is verified

This also delays sending the welcome email till after the initial email address confirmation has happened.
Merge pull request #2773 from jezdez/bug1056950

fix bug 1056950 - only send welcome email when at least one email address is verified
fix bug 1072921 - make sure some of the allauth tests are better isolated with regard to user object creation