Global cleanup of stripe payment feature
-  we are using stripe-rails gem instead of the stripe ruby wrapper,
   this gem adds nice helpers and easy access to webhooks (not
implemented in our app yet)
-  I added a placeholder 'primo' stripe plan (name and details can
   be changed in an initializer)
-  a first time user is granted a free trial period without providing
credit card data. During this period he has full access to the site.
-  visiting /profile (remind to add a link in navbar!) he can access his
   subscription details and update to a paid subscription from here
-  when trial expires the user cannot see his requirements/proofs but he
   has access to his progress
-  he can pay to resume full access
-  specs for free trial status are up and passing through a real
   interface with stripe (need to add a fake stripe service soon)
-  paid subscribers options (change credit card, cancel
   subscription) are not implemented in the current app state
adding byebug
allow focusing specs running with symbols