test_threading_2.py: make sure we use gevent in spawned subprocesses as well; this fixes a number of failures

socket: fix typo and possible NameError in connect_ex: it should be EAGAIN, not EGAIN. Patch by Alexey Borzenkov.

However, keep printing the repr of the offending object

webchat example: use file on disk rather than in-memory database. not sure why, but :memory: now gives me OperationalError: no such table django_session