let plugins.js allow widgets to utilize hooks

src/plugins.js

@@ -375,8 +375,10 @@ var fs = require('fs'),
 					dirs = dirs.map(function(file) {
 						return path.join(npmPluginPath, file);
 					}).filter(function(file) {
-						var stats = fs.statSync(file);
-						if (stats.isDirectory() && file.substr(npmPluginPath.length + 1, 14) === 'nodebb-plugin-') return true;
+						var stats = fs.statSync(file),
+							isPlugin =  file.substr(npmPluginPath.length + 1, 14) === 'nodebb-plugin-' || file.substr(npmPluginPath.length + 1, 14) === 'nodebb-widget-';
+							
+						if (stats.isDirectory() && isPlugin) return true;
 						else return false;
 					});