Modify bought_leads, index and reserved_leads
Add Payment model and create associations between Lead and User through it
Modify bought_leads view
Modify leads controller, payments controller and index
Remove Campaign, Payment, Relationship models, controllers, active_admin and migrations
Prepare all views for User, Lead and Order controller
Modify index and show for LEAD
Update order from show (for users where wallet >= 10)
Modify lead index and show
Fix lead view and index, add show only if leads.reverse_orders < 5
Modify orders index
Modify orders_show