Refactored/styled Payments:

For Model, ensured is_refunded? works

For Views, added TODO in _payment_form about needing to figure out how to remove inline javascript, also general formatting

For Controller, formated permitted_params

For CSS, created payments.css.scss for payment-buttons styling and created .max-width in style.css.scss for setting width to 100%
Merge branch 'style-project-nick' into style-project