Add signupAutoLogin first attempt. Related #57 and auth0/widget#29
Add usernameFromEmail default to true for AD signin connections. Related #57
Update validate and submit methods. Make them part of the constructor and cleanup onsubmit event handler
Rename signupAutoLogin to loginAfterSignup
Add properly handling of callback if provided
Fix container check call
Update example/index.html
Rename usernameFromEmail option to defaultADUsernameFromEmail
Rename defaultADUsernameFromEmail to defaultADUsernameFromEmailPrefix
Bump auth0-js@5.0.0 and fix tests