Add device_id to cash_out_actions table (#164)

If a costumer originates a cashOut transaction at one device, and then
redeemed at a different device, the wrong machine would have bills debited from it.

With device_id being saved at the cash_out_actions table the bills can
be properly reconciled.

migrations/1536651947391-add-device-id-to-cash-out-actions.js

@@ -0,0 +1,12 @@
+var db = require('./db')
+
+exports.up = function (next) {
+  var sql = [
+    "alter table cash_out_actions add device_id text not null default ''"
+  ]
+  db.multi(sql, next)
+}
+
+exports.down = function (next) {
+  next()
+}