Add support for hash args in the tokenizer and parser

lib/handlebars/ast.js

@@ -52,6 +52,11 @@ var Handlebars = require("handlebars");
     this.string = string;
   };
 
+  Handlebars.AST.HashNode = function(pairs) {
+    this.type = "hash";
+    this.pairs = pairs;
+  };
+
   Handlebars.AST.IdNode = function(parts) {
     this.type = "ID";
     this.original = parts.join("/");