Psycopg 2.5.3 released

Hello,

I've just released Psycopg version 2.5.3. This version contains
several bug fixes over the previous release 2.5.2:

- Work around pip issue #1630 making installation via 'pip -e git+url'
impossible (ticket #18).
- Copy operations correctly set the 'cursor.rowcount' attribute (ticket
#180).
- It is now possible to call 'get_transaction_status()' on closed
connections.
- Fixed unsafe access to object names causing assertion failures in
Python 3 debug builds (ticket #188).
- Mark the connection closed if found broken on 'poll()' (from ticket
#192 discussion)
- Fixed handling of 'dsn' and 'closed' attributes in connection
subclasses failing to connect (from ticket #192 discussion).
- Added arbitrary but stable order to 'Range' objects, thanks to Chris
Withers (ticket #193).
- Avoid blocking async connections on connect (ticket #194). Thanks to
Adam Petrovich for the bug report and diagnosis.
- Don't segfault using poorly defined cursor subclasses which forgot to
call the superclass init (ticket #195).
- Mark the connection closed when a Socket connection is broken, as it
happens for TCP connections instead (ticket #196).
- Fixed overflow opening a lobject with an oid not fitting in a signed
int (ticket #203).
- Fixed handling of explicit default 'cursor_factory=None' in
'connection.cursor()' (ticket #210).
- Fixed possible segfault in named cursors creation.
- Fixed debug build on Windows, thanks to James Emerton.

Thank you very much to everybody helping with this release!

-- Daniele