Ignore email case when accepting invites after signup

[mwayne]

When using django-allauth and ACCEPT_INVITE_AFTER_SIGNUP, the Invitation object is obtained by using the new User's email address. Even if a user signs up with an email that differs from the one used on the invite, allauth will normally still associate the Invitation email address with the new User.

If a user simply alters the case of the email address during signup (user@example.com -> USER@EXAMPLE.COM), allauth's cleanup_email_addresses() function can result in the new User email matching the case given during signup, rather than the case used on the invite. This will cause the invite to never properly be accepted, as the current implementation of accept_invite_after_signup() does not ignore case.

[coveralls]

Coverage increased (+0.2%) to 39.025% when pulling 4cc21e3 on mwayne:bug/invitations-case-sensitive-email into 39c10b8 on bee-keeper:master.

[coveralls]

Coverage increased (+0.007%) to 38.802% when pulling 4cc21e3 on mwayne:bug/invitations-case-sensitive-email into 39c10b8 on bee-keeper:master.

[coveralls]

Coverage increased (+0.2%) to 39.025% when pulling 4cc21e3 on mwayne:bug/invitations-case-sensitive-email into 39c10b8 on bee-keeper:master.

[coveralls]

Coverage increased (+0.2%) to 39.025% when pulling 4cc21e3 on mwayne:bug/invitations-case-sensitive-email into 39c10b8 on bee-keeper:master.

[bee-keeper]

Thanks for this. Appreciate the test as well!