Fix imaplib 'IMAP' module reference to 'IMAP4'
Fix imaplib 'IMAP' module reference to 'IMAP4'

On IMAP login error: 'imaplib' has no 'IMAP' member; maybe 'IMAP4'

rossp/django-helpdesk,gwasser/django-helpdesk,gwasser/django-helpdesk,django-helpdesk/django-helpdesk,django-helpdesk/django-helpdesk,rossp/django-helpdesk,rossp/django-helpdesk,gwasser/django-helpdesk,django-helpdesk/django-helpdesk,gwasser/django-helpdesk,rossp/django-helpdesk,django-helpdesk/django-helpdesk