Minor modifications to the grammar to allow a single trailing comma f…

…or function call arguments, array literal and object literals. Adjusted tests accordingly

lib/grammar.js

@@ -233,6 +233,10 @@
         return new ObjectNode($2);
       }), o("{ IndentedAssignList }", function() {
         return new ObjectNode($2);
+      }), o("{ AssignList , }", function() {
+        return new ObjectNode($2);
+      }), o("{ IndentedAssignList , }", function() {
+        return new ObjectNode($2);
       })
     ],
     // Class definitions have optional bodies of prototype property assignments,
@@ -292,11 +296,15 @@
     // The list of arguments to a function call.
     Arguments: [o("CALL_START ArgList CALL_END", function() {
         return $2;
+      }), o("CALL_START ArgList , CALL_END", function() {
+        return $2;
       })
     ],
     // Calling super.
     Super: [o("SUPER CALL_START ArgList CALL_END", function() {
         return new CallNode('super', $3);
+      }), o("SUPER CALL_START ArgList , CALL_END", function() {
+        return new CallNode('super', $3);
       })
     ],
     // A reference to the *this* current object, either naked or to a property.
@@ -323,6 +331,8 @@
     // The array literal.
     Array: [o("[ ArgList ]", function() {
         return new ArrayNode($2);
+      }), o("[ ArgList , ]", function() {
+        return new ArrayNode($2);
       })
     ],
     // The **ArgList** is both the list of objects passed into a function call,