Add Hash arguments to simple mustaches (TODO: add Hash args to block helpers)

lib/handlebars/ast.js

@@ -11,10 +11,11 @@ var Handlebars = require("handlebars");
     if(inverse) { this.inverse = new Handlebars.AST.ProgramNode(inverse); }
   };
 
-  Handlebars.AST.MustacheNode = function(params, unescaped) {
+  Handlebars.AST.MustacheNode = function(params, hash, unescaped) {
     this.type = "mustache";
     this.id = params[0];
     this.params = params.slice(1);
+    this.hash = hash;
     this.escaped = !unescaped;
   };