Repurpose JoinController to ApplicantsController
Convert Applicant to ActiveRecord model
Extract stripe methods to module
Add validations to user model
Remove Join related views
Add link to manage applicants
Update routes for blurbs
Generate files for applicants
Extract stripe payment fields to partial
Add stripe fields to applicant model
Add tests for applicants
Extract stripe methods to module
Add Stripe payments to membership application
Add Stripe payments to membership application