Update to 0.1.23

Version 0.1.23
~~~~~~~~~~~~~~
Released: 2012-08-29

New Features:
 - Get udevrulesdir from pkg-config (Benedikt Morbach)

Bugfixes:
 - Assorted documentation fixes (Evan Nemerson)
 - Do not try to add duplicate sysfs devices (Richard Hughes)

Version 0.1.22
~~~~~~~~~~~~~~
Released: 2012-06-27

New Features:
 - Add a Vala version of cd-gtk-demo (Evan Nemerson)
 - Split out colord-gtk to a new sub-project to prevent a dep loop (Richard Hughes)

Bugfixes:
 - Add many generic introspection type arguments (Evan Nemerson)
 - Check any files in /usr/share/color/icc have the content type application/vnd.iccprofile (Richard Hughes)
 - Do not try to create the same object paths if two sensors of the same type are plugged in (Richard Hughes)
 - Fix the udev rules entry for the i1Display3 (Wolfgang Goetz)