noosfero | Fix user email validation (#644)

[Gabriela]

New Merge Request #644

https://gitlab.com/noosfero/noosfero/merge_requests/644

Project:Branches: softwarepublico/noosfero:fix_user_email_validation to noosfero/noosfero:master
Author:    Gabriela
Assignee:  Daniela Feitosa

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