Returns a Contact by it's email

        :param email: email to get contact for
        :return: Contact for specified email
        :rtype: Contact

def get_contact_by_email(self, email):
        """ Returns a Contact by it's email

        :param email: email to get contact for
        :return: Contact for specified email
        :rtype: Contact
        """
        if not email:
            return None

        email = email.strip()
        query = self.q().any(collection='email_addresses', attribute='address',
                             word=email, operation='eq')
        contacts = self.get_contacts(limit=1, query=query)
        return contacts[0] if contacts else None