Added email verification for users

The verification email is sent if needed when profile is updated (either when the email is changed from the previous time or it was an old account and didn't have the token value)

You can test it here: http://verify.gae-init.appspot.com/profile/

![screen shot 2014-08-14 at 19 46 25](https://cloud.githubusercontent.com/assets/125676/3924464/a9cb5d1e-23dd-11e4-9c63-54d00363f42c.png)
No if I update my profile with your email for example, on Update you will receive an email to verify that account. If you click on it, it will be verified and you'll be automatically logged in with my account.. so the more I think about it the scarier it gets..