Resolve "Add dynamic configuration files"

Closes #27 (closed)

config/default.js

 /**
- * File: config.js
+ * File: default.js
  * Author: Markus Grigull <mgrigull@eonerc.rwth-aachen.de>
- * Date: 23.06.2016
+ * Date: 10.05.2018
  *
  * This file is part of VILLASweb-backend.
  *
@@ -19,33 +19,17 @@
  * along with VILLASweb-backend. If not, see <http://www.gnu.org/licenses/>.
  ******************************************************************************/
 
+'use strict';
+
 module.exports = {
-  publicDir: '../public',
-  development: {
+    port: 4000,
     databaseName: 'VILLAS',
     databaseURL: 'mongodb://localhost:27017/',
-    amqpEndpoint: 'amqp://localhost',
-    amqpUpdateRate: 5,
-    port: 4000,
     secret: 'longsecretislong',
-    logLevel: 'verbose',        // possible values: error, warn, info, verbose or debug
-    admin: {
-      username: 'admin',
-      password: 'admin'
-    }
-  },
-  production: {
-    databaseName: 'VILLAS',
-    databaseURL: 'mongodb://database:27017/',
-    amqpEndpoint: 'amqp://rabbit',
+    amqpEndpoint: 'amqp://localhost',
     amqpUpdateRate: 60,
-    port: 4000,
-    secret: 'longsecretislong',
-    logLevel: 'warn',         // possible values: error, warn, info, verbose or debug
-    logFile: 'villasweb-backend_log.txt',
-    admin: {
-      username: 'admin',
-      password: 'admin'
-    }
-  }
+    logLevel: 'error',
+    logFile: './log.txt',
+    publicDir: '../public',
+    defaultAdmin: false
 };