modified the try except finally block to make it compatible with python2.4

setup.py

@@ -104,6 +104,7 @@ if not release:
     FULL_VERSION += '.dev-' + HG_REVISION
 
     a = open(filename, 'w')
+    try:
     	try:
         	a.write(cnt % {'version': VERSION,
                        	'full_version' : FULL_VERSION,