enable plugins by configuration

lib/crowi/index.js

@@ -337,8 +337,9 @@ Crowi.prototype.buildServer = function() {
   require('./express-init')(this, app);
 
   // import plugins
-  var isEnabledPlugins = true;    // TODO retrieve from config
+  var isEnabledPlugins = this.config.crowi['plugin:isEnabledPlugins'] || false;
   if (isEnabledPlugins) {
+    debug('plugins enabled');
     require('../plugins')(this, app);
   }