Resolve "Add dynamic configuration files"

Closes #27 (closed)

config/index.js

+/**
+ * File: index.js
+ * Author: Markus Grigull <mgrigull@eonerc.rwth-aachen.de>
+ * Date: 10.05.2018
+ *
+ * This file is part of VILLASweb-backend.
+ *
+ * VILLASweb-backend is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * VILLASweb-backend is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with VILLASweb-backend. If not, see <http://www.gnu.org/licenses/>.
+ ******************************************************************************/
+
+'use strict';
+
+const _ = require('lodash');
+
+const defaults = require('./default');
+const config = require('./' + (process.env.NODE_ENV || 'development'));
+
+// merge configuration file with defaults
+module.exports = _.merge({}, defaults, config, { environment: process.env.NODE_ENV || 'development' });