Use knex instead of js-data

lib/db/connector.js

@@ -0,0 +1,27 @@
+var path = require('path');
+var knexModule = require('knex');
+
+module.exports = function connector(options) {
+  var dbOptions = options.dbOptions;
+  dbOptions.useNullAsDefault = true;
+  if (!dbOptions.migrate) {
+    return knexModule(dbOptions);
+  }
+
+  dbOptions.migrations = { directory: path.resolve(__dirname, 'migrations') };
+  dbOptions.seeds = { directory: path.resolve(__dirname, 'seeds') };
+  var knex = knexModule(dbOptions);
+
+  knex.migrate.latest()
+    .then(function() {
+      return knex.seed.run();
+    })
+    .then(function() {
+      console.log('Migrations are finished.');
+    })
+    .catch(function(error) {
+      console.error(error);
+    });
+
+  return knexModule(dbOptions);
+};