add machine_configs migration

migrations/006-add-machine-config.js

@@ -0,0 +1,14 @@
+'use strict'
+
+var db = require('./db')
+
+exports.up = function (next) {
+  db.query('CREATE TABLE IF NOT EXISTS machine_configs ( ' +
+    'id serial PRIMARY KEY, ' +
+    'device_fingerprint text NOT NULL, ' +
+    'data json NOT NULL )', next)
+}
+
+exports.down = function (next) {
+  next()
+}