Using the syntax of the given file for the detection

Author: kizu

lib/csscomb.js

@@ -175,7 +175,8 @@ Comb.prototype = {
     processFile: function(path) {
         var _this = this;
         if (_this._detect) {
-            return _this.processString(fs.readFileSync(path, 'utf8'), path);
+            var syntax = path.split('.').pop();
+            return _this.processString(fs.readFileSync(path, 'utf8'), syntax, path);
         }
         if (this._shouldProcessFile(path)) {
             return vfs.read(path, 'utf8').then(function(data) {