Added logic to make temp files writable before removing them because

read-only files can't be removed on windows.

buildout.cfg

@@ -7,7 +7,9 @@ find-links = http://download.zope.org/distribution/
 recipe = zc.recipe.testrunner
 eggs = ZODB3
 initialization = 
-  import os, tempfile, shutil
+  import os, tempfile, shutil, stat
+  [[os.chmod(os.path.join(path, f), stat.S_IWUSR) for f in files]
+    for (path, dirs, files) in os.walk(os.getcwd())]
   if os.path.exists('tmp'): shutil.rmtree('tmp')
   os.mkdir('tmp')
   tempfile.tempdir = os.path.abspath('tmp')