Fixed #19545 -- Make sure media/is_multipart work with empty formsets
Updated comment about PostGIS bug 2035

PostGIS 2.0.2 has been released on December 3rd 2012, with the
fix included.
Fixed #19134 -- Allowed closing smtp backend when the server is stopped

Thanks Sebastian Noack for the report and the initial patch.
Fixed #19382 -- Stopped smtp backend raising exception when already closed

Thanks Sebastian Noack for the report and the initial patch.
Added documentation for the 'db' argument of the post-syncdb signal.
Replaced deprecated sslerror by ssl.SSLError

The exact conditions on which this exception is raised are not
known, but this replacement is the best guess we can do at this
point.
Fixed #19192 -- Allowed running tests with dummy db backend

Thanks Simon Charette for the initial patch, and Jan Bednařík for
his work on the ticket.
Fixed #19562 -- cleaned up password storage docs
Fixed #12914 -- Use yaml faster C implementation when available

Thanks Beuc for the report and the initial patch.
Merge remote-tracking branch 'upstream/master'
Fixed #19173 -- Made EmptyQuerySet a marker class only

The guarantee that no queries will be made when accessing results is
done by new EmptyWhere class which is used for query.where and having.

Thanks to Simon Charette for reviewing and valuable suggestions.
Tests for various emptyqs tickets

The tickets are either about different signature between qs.none() and
qs or problems with subclass types (either EmptyQS overrided the custom
qs class, or EmptyQS was overridden by another class - values() did
this).

Fixed #15959, fixed #17271, fixed #17712, fixed #19426
Merge remote-tracking branch 'upstream/master'