Add foundation 5 styling

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- use ‘foundation_rails_helper’
Fix problem login
 
- had to use ‘form_for_without_foundation’ in the form_for
- otherwise get ‘undefined method `human_attribute_name' for NilClass:Class’
- is it same as issue ( https://github.com/sgruhier/foundation_rails_helper/issues/33 )?
Prevent repeating seed data
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