Feature/irkerhook py3k support

See merge request esr/irker!19

Fix incorrect filename in Makefile rule

See merge request esr/irker!17

Only close the connection if it still exists

See merge request !16

run daemon as the irker user (Close: #832758)

See merge request !15

Only HTTPError has a code attribute

See merge request !14

Make systemd unit use a dedicated user, and note this in the install documentation

See merge request !13

improve irkerd.service

See merge request !12

self.connection is set to None if there is a timeout.

this is an improvement upon the default .service file. it requires a
irker user to be created, something which is automatically handled by
the debian package, but should be handled by other distributions when
deploying the .service file.

there are obvious dangers in running irkerd as root: a compromise
would be catastrophic, and since it runs on public servers that are
traditionnally pretty hostile (IRC), it seems critical that rights of
the daemon be limited.

irkerd should not be launched as root.

admins might not remember whether the service is called "irkerd" or
"irker".

"irker daemon" doesn't really describe the service to someone who
doesn't already know what it is.

the .service file does not currently point to the relevant
documentation.

this patch addresses all of the above issues.

Fix irk for Python 3 and Unicode input

There were several issues:
- json.dumps does not have an encoding parameter in Python 3.
- Forcing the json.dumps encoding to ASCII prevents any non-ASCII
  character in the message. To avoid having non-ASCII characters in the
  *dump*, the only needed parameter is ensure_ascii=True which is the
  default.
- To coerce a str to bytes in Python 3, an encoding must be provided
  even when it only contains ASCII characters.
  The solution is to use the encode() method which is available in both
  versions.

See merge request !7

There were several issues:
- json.dumps does not have an encoding parameter in Python 3.
- Forcing the json.dumps encoding to ASCII prevents any non-ASCII
  character in the message. To avoid having non-ASCII characters in the
  *dump*, the only needed parameter is ensure_ascii=True which is the
  default.
- To coerce a str to bytes in Python 3, an encoding must be provided
  even when it only contains ASCII characters.
  The solution is to use the encode() method which is available in both
  versions.

Use abbreviated hash for short format

Use git log's '%h' to get the abbreviated hash for the commit.

Fixes issue #7 

See merge request !6

Don't hang when confronted with urls which require authentication

When faced with an url that requires authentication, irkerhook currently blows up rather messily, because urllib.urlopen attempts to prompt the user for a password, which unsurprisingly fails, leading to the hook failing completely with an EOFError .

This changes irkerhook.py to use urllib2 here, so this failure can be detected more easily and the a more sensible answer can be returned.

The debian package currently uses the more heavy-handed "0004-webview.patch" to solve the same problem - http://anonscm.debian.org/viewvc/python-apps/packages/irker/trunk/debian/patches/0004-webview.patch?revision=12689&view=markup

See merge request !5

Reverts some 2to3 botches.