Fix a couple of lint issues, and update to version 2 (github).

.gitignore

@@ -1,3 +1,5 @@
+.DS_Store
+._*
 *.a
 *.o
 /support/xhpast/xhpast

scripts/arcanist.php

@@ -116,7 +116,7 @@ try {
       'conduit.connect',
       array(
         'client'            => 'arc',
-        'clientVersion'     => 1,
+        'clientVersion'     => 2,
         'clientDescription' => php_uname('n').':'.$description,
         'user'              => getenv('USER'),
       ));

support/xhpast/parser_nodes.php

@@ -1,5 +1,21 @@
 <?php
 
+/*
+ * Copyright 2011 Facebook, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
 function xhp_parser_node_constants() {
   return array(
     9000 => 'n_PROGRAM',