fix willyelm#1 pug plugin support.

Author: uk-taniyama

lib/index.js

@@ -19,6 +19,16 @@ module.exports = function (source) {
     doctype: query.doctype || 'js',
     compileDebug: this.debug || false
   }, query)
+  if (options.plugins){
+    if (typeof options.plugins === 'string') {
+      options.plugins = [options.plugins];
+    }
+    if (Array.isArray(options.plugins)) {
+      options.plugins = options.plugins.map(function (plugin) {
+        return require(plugin);
+      });
+    }
+  }
   let template = pug.compile(source, options)
   let data = query.data || {}
   let html = template(data)