EmailAddress.email has default max_length (=75), increase to 254 to comply to standards

[pennersr]

For django-allauth I am running into an issue where Facebook hands over email addresses that are longer than 75 characters. For reference, also refer to:

http://code.djangoproject.com/ticket/11365

As Django will not be fixed, I was hoping that email-confirmation could switch to max_length=254 so that it can handle long email addresses.