Psycopg 2.5 released

New features:

- Added JSON adaptation.
- Added support for PostgreSQL 9.2 range types .
- 'connection' and 'cursor' objects can be used in "with" statements
  as context managers as specified by a recent DBAPI  extension.
- Added 'Diagnostics' object to get extended info from a database error.
  Many thanks to Matthew Woodcraft for the implementation (ticket #149).
- Added 'connection.cursor_factory' attribute to customize the default
  object returned by 'cursor()'.
- Added support for backward scrollable cursors. Thanks to Jon Nelson
  for the initial patch (ticket #108).
- Added a simple way to customize casting of composite types into
  Python objects other than namedtuples.  Many thanks to Ronan Dunklau
  and Tobias Oberstein for the feature development.
- 'connection.reset()' implemented using 'DISCARD ALL' on server
  versions supporting it.

Bug fixes:

- Properly cleanup memory of broken connections (ticket #148).
- Fixed bad interaction of 'setup.py' with other dependencies in
  Distribute projects on Python 3 (ticket #153).

Other changes:

- Added support for Python 3.3.
- Dropped support for Python 2.4. Please use Psycopg 2.4.x if you
  need it.
- 'errorcodes' map updated to PostgreSQL 9.2.
- Dropped Zope adapter from source repository. ZPsycopgDA now has its
  own project at <http://github.com/psycopg/ZPsycopgDA>.
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