Fixed new user email notification
Review Request #2567 — Created Aug. 29, 2011 and submitted
The email notification didn't work due to the incorrect format of admin's email. In addition, the previous unit test failed to catch this error, since it relied on Django email test framework, which implements differently between real email sending and test email sending. Now, the email format is fixed by using build_email_address and the unit test was rewrote.
United and manually tested.