Since https://phab.mercurial-scm.org/D3055, lookup method accepts only
string and no more integers.

This method was removed in Mercurial 4.8, see
https://phab.mercurial-scm.org/D3037

Use highest SSL version supported by both sides

See merge request esr/irker!10

do not hardcode syslog devices

See merge request esr/irker!11

Drop sorted() from event_handler

Closes #11

See merge request esr/irker!18

Feature/irkerhook py3k support

See merge request esr/irker!19

Fix incorrect filename in Makefile rule

See merge request esr/irker!17

This breaks on python 3 with "TypeError: unorderable types:"

The sorting was originally added to irclib to fix
https://sourceforge.net/p/python-irclib/bugs/9/
( in https://github.com/jaraco/irc/commit/ad159cbbf1d00fe15876a61d0abf88e43f5112ca)
but as irkerd doesn't have event priorties, the issue doesn't
apply here anyway.

This closes #11.

Only close the connection if it still exists

See merge request !16