Removing extra _this, adding clarifying whitespace.

Author: anton-rudeshko

lib/csscomb.js

@@ -76,23 +76,25 @@ Comb.prototype = {
      * @param {Number} level Indent level
      */
     processNode: function(node, level) {
-        var _this = this;
         node.forEach(function(node) {
             if (!Array.isArray(node)) return;
+
             var nodeType = node.shift();
-            _this._handlers.forEach(function(handler) {
+            this._handlers.forEach(function(handler) {
                 handler.process(nodeType, node, level);
             });
             node.unshift(nodeType);
+
             if (nodeType === 'atrulers') level++;
-            _this.processNode(node, level);
-        });
+
+            this.processNode(node, level);
+        }, this);
     },
 
     /**
      * Process file provided with a string.
      * @param {String} text
-     * @param {String} filename
+     * @param {String} [filename]
      */
     processString: function(text, filename) {
         if (!text) return text;