removed the .gitattributes files (closes #6605, reverts #5674)

* 2.0:
  updated license year
  Update src/Symfony/Component/HttpFoundation/Response.php
  [Console] fixed unitialized properties (closes #5935)
  [Bundle] [FrameworkBundle] fixed typo in phpdoc of the SessionListener.
  bumped Symfony version to 2.0.21-DEV
  updated VERSION for 2.0.21
  updated CHANGELOG for 2.0.21

Conflicts:
	src/Symfony/Bundle/SwiftmailerBundle/LICENSE
	src/Symfony/Component/Filesystem/LICENSE
	src/Symfony/Component/HttpFoundation/Response.php
	src/Symfony/Component/HttpKernel/Kernel.php

.gitattributes

@@ -1,2 +0,0 @@
-Tests/ export-ignore
-phpunit.xml.dist export-ignore

LICENSE

@@ -1,4 +1,4 @@
-Copyright (c) 2004-2012 Fabien Potencier
+Copyright (c) 2004-2013 Fabien Potencier
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal

composer.json

@@ -26,10 +26,5 @@
         "psr-0": { "Symfony\\Component\\ClassLoader": "" }
     },
     "target-dir": "Symfony/Component/ClassLoader",
-    "minimum-stability": "dev",
-    "extra": {
-        "branch-alias": {
-            "dev-master": "2.1-dev"
-        }
-    }
+    "minimum-stability": "dev"
 }