Bump to 2.0 RC 3 dev.
Fix reverse() of 'password-reset-confirm' for email template.

The email template for resetting a password was still using "uidb36" for the
user ID, but Django has changed to "uidb64". This was causing an error when
users attempted to reset their password.

Fixes bug 3301.

Reviewed at https://reviews.reviewboard.org/r/5672/