Fix all model tests
Fix controller test by using add_creator
Replace 'space.user' to 'space.creator'
Change plan type from symbol (:free, :base) to enum
Downcase email when signup
Save model user after reset token

- Fix all controllter tests
Fix warning: Model.scoped is deprecated

- http://stackoverflow.com/questions/18198963/with-rails-4-model-scoped-is-deprecated-but-model-all-cant-replace-it