feat(premium): disallow deleting accounts until they've cancelled

payment plans

src/controllers/user.js

@@ -260,6 +260,8 @@ api.cron = function(req, res, next) {
 // api.reset // Shared.ops
 
 api['delete'] = function(req, res, next) {
+  if (res.locals.user.purchased.plan.customerId)
+    return res.json(400,{err:"You have an active subscription, cancel your plan before deleting your account."});
   res.locals.user.remove(function(err){
     if (err) return next(err);
     res.send(200);