Use cStringIO to open zip files in python 2.5

ChangeLog

@@ -28,6 +28,7 @@
 	* Minor speedup in parsing blocklists
 	* Blocklist now attempts to download the URL multiple times before giving
 	  up
+	* Fix blocklist not being able to open zipped blocklists with python 2.5
 
 ==== Web ====
 	* Put the default password in the manpage.

deluge/plugins/blocklist/blocklist/decompressers.py

@@ -39,7 +39,13 @@ def Zipped(reader):
     """Blocklist reader for zipped blocklists"""
     def open(self):
         z = zipfile.ZipFile(self.file)
-        return z.open(z.namelist()[0])
+        if hasattr(z, 'open'):
+            f = z.open(z.namelist()[0])
+        else:
+            # Handle python 2.5
+            import cStringIO
+            f = cStringIO.StringIO(z.read(z.namelist()[0]))
+        return f
     reader.open = open
     return reader